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Vehicle-Anti-Theft-Face-Rec.../venv/Lib/site-packages/IPython/core/display.py

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# -*- coding: utf-8 -*-
"""Top-level display functions for displaying object in different formats."""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from binascii import b2a_hex, b2a_base64, hexlify
import json
import mimetypes
import os
import struct
import sys
import warnings
from copy import deepcopy
from os.path import splitext
from pathlib import Path, PurePath
from IPython.utils.py3compat import cast_unicode
from IPython.testing.skipdoctest import skip_doctest
__all__ = ['display', 'display_pretty', 'display_html', 'display_markdown',
'display_svg', 'display_png', 'display_jpeg', 'display_latex', 'display_json',
'display_javascript', 'display_pdf', 'DisplayObject', 'TextDisplayObject',
'Pretty', 'HTML', 'Markdown', 'Math', 'Latex', 'SVG', 'ProgressBar', 'JSON',
'GeoJSON', 'Javascript', 'Image', 'clear_output', 'set_matplotlib_formats',
'set_matplotlib_close', 'publish_display_data', 'update_display', 'DisplayHandle',
'Video']
#-----------------------------------------------------------------------------
# utility functions
#-----------------------------------------------------------------------------
def _safe_exists(path):
"""Check path, but don't let exceptions raise"""
try:
return os.path.exists(path)
except Exception:
return False
def _merge(d1, d2):
"""Like update, but merges sub-dicts instead of clobbering at the top level.
Updates d1 in-place
"""
if not isinstance(d2, dict) or not isinstance(d1, dict):
return d2
for key, value in d2.items():
d1[key] = _merge(d1.get(key), value)
return d1
def _display_mimetype(mimetype, objs, raw=False, metadata=None):
"""internal implementation of all display_foo methods
Parameters
----------
mimetype : str
The mimetype to be published (e.g. 'image/png')
objs : tuple of objects
The Python objects to display, or if raw=True raw text data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
if metadata:
metadata = {mimetype: metadata}
if raw:
# turn list of pngdata into list of { 'image/png': pngdata }
objs = [ {mimetype: obj} for obj in objs ]
display(*objs, raw=raw, metadata=metadata, include=[mimetype])
#-----------------------------------------------------------------------------
# Main functions
#-----------------------------------------------------------------------------
# use * to indicate transient is keyword-only
def publish_display_data(data, metadata=None, source=None, *, transient=None, **kwargs):
"""Publish data and metadata to all frontends.
See the ``display_data`` message in the messaging documentation for
more details about this message type.
Keys of data and metadata can be any mime-type.
Parameters
----------
data : dict
A dictionary having keys that are valid MIME types (like
'text/plain' or 'image/svg+xml') and values that are the data for
that MIME type. The data itself must be a JSON'able data
structure. Minimally all data should have the 'text/plain' data,
which can be displayed by all frontends. If more than the plain
text is given, it is up to the frontend to decide which
representation to use.
metadata : dict
A dictionary for metadata related to the data. This can contain
arbitrary key, value pairs that frontends can use to interpret
the data. mime-type keys matching those in data can be used
to specify metadata about particular representations.
source : str, deprecated
Unused.
transient : dict, keyword-only
A dictionary of transient data, such as display_id.
"""
from IPython.core.interactiveshell import InteractiveShell
display_pub = InteractiveShell.instance().display_pub
# only pass transient if supplied,
# to avoid errors with older ipykernel.
# TODO: We could check for ipykernel version and provide a detailed upgrade message.
if transient:
kwargs['transient'] = transient
display_pub.publish(
data=data,
metadata=metadata,
**kwargs
)
def _new_id():
"""Generate a new random text id with urandom"""
return b2a_hex(os.urandom(16)).decode('ascii')
def display(*objs, include=None, exclude=None, metadata=None, transient=None, display_id=None, **kwargs):
"""Display a Python object in all frontends.
By default all representations will be computed and sent to the frontends.
Frontends can decide which representation is used and how.
In terminal IPython this will be similar to using :func:`print`, for use in richer
frontends see Jupyter notebook examples with rich display logic.
Parameters
----------
objs : tuple of objects
The Python objects to display.
raw : bool, optional
Are the objects to be displayed already mimetype-keyed dicts of raw display data,
or Python objects that need to be formatted before display? [default: False]
include : list, tuple or set, optional
A list of format type strings (MIME types) to include in the
format data dict. If this is set *only* the format types included
in this list will be computed.
exclude : list, tuple or set, optional
A list of format type strings (MIME types) to exclude in the format
data dict. If this is set all format types will be computed,
except for those included in this argument.
metadata : dict, optional
A dictionary of metadata to associate with the output.
mime-type keys in this dictionary will be associated with the individual
representation formats, if they exist.
transient : dict, optional
A dictionary of transient data to associate with the output.
Data in this dict should not be persisted to files (e.g. notebooks).
display_id : str, bool optional
Set an id for the display.
This id can be used for updating this display area later via update_display.
If given as `True`, generate a new `display_id`
kwargs: additional keyword-args, optional
Additional keyword-arguments are passed through to the display publisher.
Returns
-------
handle: DisplayHandle
Returns a handle on updatable displays for use with :func:`update_display`,
if `display_id` is given. Returns :any:`None` if no `display_id` is given
(default).
Examples
--------
>>> class Json(object):
... def __init__(self, json):
... self.json = json
... def _repr_pretty_(self, pp, cycle):
... import json
... pp.text(json.dumps(self.json, indent=2))
... def __repr__(self):
... return str(self.json)
...
>>> d = Json({1:2, 3: {4:5}})
>>> print(d)
{1: 2, 3: {4: 5}}
>>> display(d)
{
"1": 2,
"3": {
"4": 5
}
}
>>> def int_formatter(integer, pp, cycle):
... pp.text('I'*integer)
>>> plain = get_ipython().display_formatter.formatters['text/plain']
>>> plain.for_type(int, int_formatter)
<function _repr_pprint at 0x...>
>>> display(7-5)
II
>>> del plain.type_printers[int]
>>> display(7-5)
2
See Also
--------
:func:`update_display`
Notes
-----
In Python, objects can declare their textual representation using the
`__repr__` method. IPython expands on this idea and allows objects to declare
other, rich representations including:
- HTML
- JSON
- PNG
- JPEG
- SVG
- LaTeX
A single object can declare some or all of these representations; all are
handled by IPython's display system.
The main idea of the first approach is that you have to implement special
display methods when you define your class, one for each representation you
want to use. Here is a list of the names of the special methods and the
values they must return:
- `_repr_html_`: return raw HTML as a string, or a tuple (see below).
- `_repr_json_`: return a JSONable dict, or a tuple (see below).
- `_repr_jpeg_`: return raw JPEG data, or a tuple (see below).
- `_repr_png_`: return raw PNG data, or a tuple (see below).
- `_repr_svg_`: return raw SVG data as a string, or a tuple (see below).
- `_repr_latex_`: return LaTeX commands in a string surrounded by "$",
or a tuple (see below).
- `_repr_mimebundle_`: return a full mimebundle containing the mapping
from all mimetypes to data.
Use this for any mime-type not listed above.
The above functions may also return the object's metadata alonside the
data. If the metadata is available, the functions will return a tuple
containing the data and metadata, in that order. If there is no metadata
available, then the functions will return the data only.
When you are directly writing your own classes, you can adapt them for
display in IPython by following the above approach. But in practice, you
often need to work with existing classes that you can't easily modify.
You can refer to the documentation on integrating with the display system in
order to register custom formatters for already existing types
(:ref:`integrating_rich_display`).
.. versionadded:: 5.4 display available without import
.. versionadded:: 6.1 display available without import
Since IPython 5.4 and 6.1 :func:`display` is automatically made available to
the user without import. If you are using display in a document that might
be used in a pure python context or with older version of IPython, use the
following import at the top of your file::
from IPython.display import display
"""
from IPython.core.interactiveshell import InteractiveShell
if not InteractiveShell.initialized():
# Directly print objects.
print(*objs)
return
raw = kwargs.pop('raw', False)
if transient is None:
transient = {}
if metadata is None:
metadata={}
if display_id:
if display_id is True:
display_id = _new_id()
transient['display_id'] = display_id
if kwargs.get('update') and 'display_id' not in transient:
raise TypeError('display_id required for update_display')
if transient:
kwargs['transient'] = transient
if not objs and display_id:
# if given no objects, but still a request for a display_id,
# we assume the user wants to insert an empty output that
# can be updated later
objs = [{}]
raw = True
if not raw:
format = InteractiveShell.instance().display_formatter.format
for obj in objs:
if raw:
publish_display_data(data=obj, metadata=metadata, **kwargs)
else:
format_dict, md_dict = format(obj, include=include, exclude=exclude)
if not format_dict:
# nothing to display (e.g. _ipython_display_ took over)
continue
if metadata:
# kwarg-specified metadata gets precedence
_merge(md_dict, metadata)
publish_display_data(data=format_dict, metadata=md_dict, **kwargs)
if display_id:
return DisplayHandle(display_id)
# use * for keyword-only display_id arg
def update_display(obj, *, display_id, **kwargs):
"""Update an existing display by id
Parameters
----------
obj:
The object with which to update the display
display_id: keyword-only
The id of the display to update
See Also
--------
:func:`display`
"""
kwargs['update'] = True
display(obj, display_id=display_id, **kwargs)
class DisplayHandle(object):
"""A handle on an updatable display
Call `.update(obj)` to display a new object.
Call `.display(obj`) to add a new instance of this display,
and update existing instances.
See Also
--------
:func:`display`, :func:`update_display`
"""
def __init__(self, display_id=None):
if display_id is None:
display_id = _new_id()
self.display_id = display_id
def __repr__(self):
return "<%s display_id=%s>" % (self.__class__.__name__, self.display_id)
def display(self, obj, **kwargs):
"""Make a new display with my id, updating existing instances.
Parameters
----------
obj:
object to display
**kwargs:
additional keyword arguments passed to display
"""
display(obj, display_id=self.display_id, **kwargs)
def update(self, obj, **kwargs):
"""Update existing displays with my id
Parameters
----------
obj:
object to display
**kwargs:
additional keyword arguments passed to update_display
"""
update_display(obj, display_id=self.display_id, **kwargs)
def display_pretty(*objs, **kwargs):
"""Display the pretty (default) representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw text data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/plain', objs, **kwargs)
def display_html(*objs, **kwargs):
"""Display the HTML representation of an object.
Note: If raw=False and the object does not have a HTML
representation, no HTML will be shown.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw HTML data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/html', objs, **kwargs)
def display_markdown(*objs, **kwargs):
"""Displays the Markdown representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw markdown data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/markdown', objs, **kwargs)
def display_svg(*objs, **kwargs):
"""Display the SVG representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw svg data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('image/svg+xml', objs, **kwargs)
def display_png(*objs, **kwargs):
"""Display the PNG representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw png data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('image/png', objs, **kwargs)
def display_jpeg(*objs, **kwargs):
"""Display the JPEG representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw JPEG data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('image/jpeg', objs, **kwargs)
def display_latex(*objs, **kwargs):
"""Display the LaTeX representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw latex data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/latex', objs, **kwargs)
def display_json(*objs, **kwargs):
"""Display the JSON representation of an object.
Note that not many frontends support displaying JSON.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw json data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('application/json', objs, **kwargs)
def display_javascript(*objs, **kwargs):
"""Display the Javascript representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw javascript data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('application/javascript', objs, **kwargs)
def display_pdf(*objs, **kwargs):
"""Display the PDF representation of an object.
Parameters
----------
objs : tuple of objects
The Python objects to display, or if raw=True raw javascript data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('application/pdf', objs, **kwargs)
#-----------------------------------------------------------------------------
# Smart classes
#-----------------------------------------------------------------------------
class DisplayObject(object):
"""An object that wraps data to be displayed."""
_read_flags = 'r'
_show_mem_addr = False
metadata = None
def __init__(self, data=None, url=None, filename=None, metadata=None):
"""Create a display object given raw data.
When this object is returned by an expression or passed to the
display function, it will result in the data being displayed
in the frontend. The MIME type of the data should match the
subclasses used, so the Png subclass should be used for 'image/png'
data. If the data is a URL, the data will first be downloaded
and then displayed. If
Parameters
----------
data : unicode, str or bytes
The raw data or a URL or file to load the data from
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
metadata : dict
Dict of metadata associated to be the object when displayed
"""
if isinstance(data, (Path, PurePath)):
data = str(data)
if data is not None and isinstance(data, str):
if data.startswith('http') and url is None:
url = data
filename = None
data = None
elif _safe_exists(data) and filename is None:
url = None
filename = data
data = None
self.url = url
self.filename = filename
# because of @data.setter methods in
# subclasses ensure url and filename are set
# before assigning to self.data
self.data = data
if metadata is not None:
self.metadata = metadata
elif self.metadata is None:
self.metadata = {}
self.reload()
self._check_data()
def __repr__(self):
if not self._show_mem_addr:
cls = self.__class__
r = "<%s.%s object>" % (cls.__module__, cls.__name__)
else:
r = super(DisplayObject, self).__repr__()
return r
def _check_data(self):
"""Override in subclasses if there's something to check."""
pass
def _data_and_metadata(self):
"""shortcut for returning metadata with shape information, if defined"""
if self.metadata:
return self.data, deepcopy(self.metadata)
else:
return self.data
def reload(self):
"""Reload the raw data from file or URL."""
if self.filename is not None:
with open(self.filename, self._read_flags) as f:
self.data = f.read()
elif self.url is not None:
# Deferred import
from urllib.request import urlopen
response = urlopen(self.url)
data = response.read()
# extract encoding from header, if there is one:
encoding = None
if 'content-type' in response.headers:
for sub in response.headers['content-type'].split(';'):
sub = sub.strip()
if sub.startswith('charset'):
encoding = sub.split('=')[-1].strip()
break
if 'content-encoding' in response.headers:
# TODO: do deflate?
if 'gzip' in response.headers['content-encoding']:
import gzip
from io import BytesIO
with gzip.open(BytesIO(data), 'rt', encoding=encoding) as fp:
encoding = None
data = fp.read()
# decode data, if an encoding was specified
# We only touch self.data once since
# subclasses such as SVG have @data.setter methods
# that transform self.data into ... well svg.
if encoding:
self.data = data.decode(encoding, 'replace')
else:
self.data = data
class TextDisplayObject(DisplayObject):
"""Validate that display data is text"""
def _check_data(self):
if self.data is not None and not isinstance(self.data, str):
raise TypeError("%s expects text, not %r" % (self.__class__.__name__, self.data))
class Pretty(TextDisplayObject):
def _repr_pretty_(self, pp, cycle):
return pp.text(self.data)
class HTML(TextDisplayObject):
def __init__(self, data=None, url=None, filename=None, metadata=None):
def warn():
if not data:
return False
#
# Avoid calling lower() on the entire data, because it could be a
# long string and we're only interested in its beginning and end.
#
prefix = data[:10].lower()
suffix = data[-10:].lower()
return prefix.startswith("<iframe ") and suffix.endswith("</iframe>")
if warn():
warnings.warn("Consider using IPython.display.IFrame instead")
super(HTML, self).__init__(data=data, url=url, filename=filename, metadata=metadata)
def _repr_html_(self):
return self._data_and_metadata()
def __html__(self):
"""
This method exists to inform other HTML-using modules (e.g. Markupsafe,
htmltag, etc) that this object is HTML and does not need things like
special characters (<>&) escaped.
"""
return self._repr_html_()
class Markdown(TextDisplayObject):
def _repr_markdown_(self):
return self._data_and_metadata()
class Math(TextDisplayObject):
def _repr_latex_(self):
s = r"$\displaystyle %s$" % self.data.strip('$')
if self.metadata:
return s, deepcopy(self.metadata)
else:
return s
class Latex(TextDisplayObject):
def _repr_latex_(self):
return self._data_and_metadata()
class SVG(DisplayObject):
"""Embed an SVG into the display.
Note if you just want to view a svg image via a URL use `:class:Image` with
a url=URL keyword argument.
"""
_read_flags = 'rb'
# wrap data in a property, which extracts the <svg> tag, discarding
# document headers
_data = None
@property
def data(self):
return self._data
@data.setter
def data(self, svg):
if svg is None:
self._data = None
return
# parse into dom object
from xml.dom import minidom
x = minidom.parseString(svg)
# get svg tag (should be 1)
found_svg = x.getElementsByTagName('svg')
if found_svg:
svg = found_svg[0].toxml()
else:
# fallback on the input, trust the user
# but this is probably an error.
pass
svg = cast_unicode(svg)
self._data = svg
def _repr_svg_(self):
return self._data_and_metadata()
class ProgressBar(DisplayObject):
"""Progressbar supports displaying a progressbar like element
"""
def __init__(self, total):
"""Creates a new progressbar
Parameters
----------
total : int
maximum size of the progressbar
"""
self.total = total
self._progress = 0
self.html_width = '60ex'
self.text_width = 60
self._display_id = hexlify(os.urandom(8)).decode('ascii')
def __repr__(self):
fraction = self.progress / self.total
filled = '=' * int(fraction * self.text_width)
rest = ' ' * (self.text_width - len(filled))
return '[{}{}] {}/{}'.format(
filled, rest,
self.progress, self.total,
)
def _repr_html_(self):
return "<progress style='width:{}' max='{}' value='{}'></progress>".format(
self.html_width, self.total, self.progress)
def display(self):
display(self, display_id=self._display_id)
def update(self):
display(self, display_id=self._display_id, update=True)
@property
def progress(self):
return self._progress
@progress.setter
def progress(self, value):
self._progress = value
self.update()
def __iter__(self):
self.display()
self._progress = -1 # First iteration is 0
return self
def __next__(self):
"""Returns current value and increments display by one."""
self.progress += 1
if self.progress < self.total:
return self.progress
else:
raise StopIteration()
class JSON(DisplayObject):
"""JSON expects a JSON-able dict or list
not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict or list containers.
"""
# wrap data in a property, which warns about passing already-serialized JSON
_data = None
def __init__(self, data=None, url=None, filename=None, expanded=False, metadata=None, root='root', **kwargs):
"""Create a JSON display object given raw data.
Parameters
----------
data : dict or list
JSON data to display. Not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict
or list containers.
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
expanded : boolean
Metadata to control whether a JSON display component is expanded.
metadata: dict
Specify extra metadata to attach to the json display object.
root : str
The name of the root element of the JSON tree
"""
self.metadata = {
'expanded': expanded,
'root': root,
}
if metadata:
self.metadata.update(metadata)
if kwargs:
self.metadata.update(kwargs)
super(JSON, self).__init__(data=data, url=url, filename=filename)
def _check_data(self):
if self.data is not None and not isinstance(self.data, (dict, list)):
raise TypeError("%s expects JSONable dict or list, not %r" % (self.__class__.__name__, self.data))
@property
def data(self):
return self._data
@data.setter
def data(self, data):
if isinstance(data, (Path, PurePath)):
data = str(data)
if isinstance(data, str):
if self.filename is None and self.url is None:
warnings.warn("JSON expects JSONable dict or list, not JSON strings")
data = json.loads(data)
self._data = data
def _data_and_metadata(self):
return self.data, self.metadata
def _repr_json_(self):
return self._data_and_metadata()
_css_t = """var link = document.createElement("link");
link.ref = "stylesheet";
link.type = "text/css";
link.href = "%s";
document.head.appendChild(link);
"""
_lib_t1 = """new Promise(function(resolve, reject) {
var script = document.createElement("script");
script.onload = resolve;
script.onerror = reject;
script.src = "%s";
document.head.appendChild(script);
}).then(() => {
"""
_lib_t2 = """
});"""
class GeoJSON(JSON):
"""GeoJSON expects JSON-able dict
not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict containers.
"""
def __init__(self, *args, **kwargs):
"""Create a GeoJSON display object given raw data.
Parameters
----------
data : dict or list
VegaLite data. Not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict
or list containers.
url_template : string
Leaflet TileLayer URL template: http://leafletjs.com/reference.html#url-template
layer_options : dict
Leaflet TileLayer options: http://leafletjs.com/reference.html#tilelayer-options
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
metadata: dict
Specify extra metadata to attach to the json display object.
Examples
--------
The following will display an interactive map of Mars with a point of
interest on frontend that do support GeoJSON display.
>>> from IPython.display import GeoJSON
>>> GeoJSON(data={
... "type": "Feature",
... "geometry": {
... "type": "Point",
... "coordinates": [-81.327, 296.038]
... }
... },
... url_template="http://s3-eu-west-1.amazonaws.com/whereonmars.cartodb.net/{basemap_id}/{z}/{x}/{y}.png",
... layer_options={
... "basemap_id": "celestia_mars-shaded-16k_global",
... "attribution" : "Celestia/praesepe",
... "minZoom" : 0,
... "maxZoom" : 18,
... })
<IPython.core.display.GeoJSON object>
In the terminal IPython, you will only see the text representation of
the GeoJSON object.
"""
super(GeoJSON, self).__init__(*args, **kwargs)
def _ipython_display_(self):
bundle = {
'application/geo+json': self.data,
'text/plain': '<IPython.display.GeoJSON object>'
}
metadata = {
'application/geo+json': self.metadata
}
display(bundle, metadata=metadata, raw=True)
class Javascript(TextDisplayObject):
def __init__(self, data=None, url=None, filename=None, lib=None, css=None):
"""Create a Javascript display object given raw data.
When this object is returned by an expression or passed to the
display function, it will result in the data being displayed
in the frontend. If the data is a URL, the data will first be
downloaded and then displayed.
In the Notebook, the containing element will be available as `element`,
and jQuery will be available. Content appended to `element` will be
visible in the output area.
Parameters
----------
data : unicode, str or bytes
The Javascript source code or a URL to download it from.
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
lib : list or str
A sequence of Javascript library URLs to load asynchronously before
running the source code. The full URLs of the libraries should
be given. A single Javascript library URL can also be given as a
string.
css: : list or str
A sequence of css files to load before running the source code.
The full URLs of the css files should be given. A single css URL
can also be given as a string.
"""
if isinstance(lib, str):
lib = [lib]
elif lib is None:
lib = []
if isinstance(css, str):
css = [css]
elif css is None:
css = []
if not isinstance(lib, (list,tuple)):
raise TypeError('expected sequence, got: %r' % lib)
if not isinstance(css, (list,tuple)):
raise TypeError('expected sequence, got: %r' % css)
self.lib = lib
self.css = css
super(Javascript, self).__init__(data=data, url=url, filename=filename)
def _repr_javascript_(self):
r = ''
for c in self.css:
r += _css_t % c
for l in self.lib:
r += _lib_t1 % l
r += self.data
r += _lib_t2*len(self.lib)
return r
# constants for identifying png/jpeg data
_PNG = b'\x89PNG\r\n\x1a\n'
_JPEG = b'\xff\xd8'
def _pngxy(data):
"""read the (width, height) from a PNG header"""
ihdr = data.index(b'IHDR')
# next 8 bytes are width/height
return struct.unpack('>ii', data[ihdr+4:ihdr+12])
def _jpegxy(data):
"""read the (width, height) from a JPEG header"""
# adapted from http://www.64lines.com/jpeg-width-height
idx = 4
while True:
block_size = struct.unpack('>H', data[idx:idx+2])[0]
idx = idx + block_size
if data[idx:idx+2] == b'\xFF\xC0':
# found Start of Frame
iSOF = idx
break
else:
# read another block
idx += 2
h, w = struct.unpack('>HH', data[iSOF+5:iSOF+9])
return w, h
def _gifxy(data):
"""read the (width, height) from a GIF header"""
return struct.unpack('<HH', data[6:10])
class Image(DisplayObject):
_read_flags = 'rb'
_FMT_JPEG = u'jpeg'
_FMT_PNG = u'png'
_FMT_GIF = u'gif'
_ACCEPTABLE_EMBEDDINGS = [_FMT_JPEG, _FMT_PNG, _FMT_GIF]
_MIMETYPES = {
_FMT_PNG: 'image/png',
_FMT_JPEG: 'image/jpeg',
_FMT_GIF: 'image/gif',
}
def __init__(self, data=None, url=None, filename=None, format=None,
embed=None, width=None, height=None, retina=False,
unconfined=False, metadata=None):
"""Create a PNG/JPEG/GIF image object given raw data.
When this object is returned by an input cell or passed to the
display function, it will result in the image being displayed
in the frontend.
Parameters
----------
data : unicode, str or bytes
The raw image data or a URL or filename to load the data from.
This always results in embedded image data.
url : unicode
A URL to download the data from. If you specify `url=`,
the image data will not be embedded unless you also specify `embed=True`.
filename : unicode
Path to a local file to load the data from.
Images from a file are always embedded.
format : unicode
The format of the image data (png/jpeg/jpg/gif). If a filename or URL is given
for format will be inferred from the filename extension.
embed : bool
Should the image data be embedded using a data URI (True) or be
loaded using an <img> tag. Set this to True if you want the image
to be viewable later with no internet connection in the notebook.
Default is `True`, unless the keyword argument `url` is set, then
default value is `False`.
Note that QtConsole is not able to display images if `embed` is set to `False`
width : int
Width in pixels to which to constrain the image in html
height : int
Height in pixels to which to constrain the image in html
retina : bool
Automatically set the width and height to half of the measured
width and height.
This only works for embedded images because it reads the width/height
from image data.
For non-embedded images, you can just set the desired display width
and height directly.
unconfined: bool
Set unconfined=True to disable max-width confinement of the image.
metadata: dict
Specify extra metadata to attach to the image.
Examples
--------
# embedded image data, works in qtconsole and notebook
# when passed positionally, the first arg can be any of raw image data,
# a URL, or a filename from which to load image data.
# The result is always embedding image data for inline images.
Image('http://www.google.fr/images/srpr/logo3w.png')
Image('/path/to/image.jpg')
Image(b'RAW_PNG_DATA...')
# Specifying Image(url=...) does not embed the image data,
# it only generates `<img>` tag with a link to the source.
# This will not work in the qtconsole or offline.
Image(url='http://www.google.fr/images/srpr/logo3w.png')
"""
if isinstance(data, (Path, PurePath)):
data = str(data)
if filename is not None:
ext = self._find_ext(filename)
elif url is not None:
ext = self._find_ext(url)
elif data is None:
raise ValueError("No image data found. Expecting filename, url, or data.")
elif isinstance(data, str) and (
data.startswith('http') or _safe_exists(data)
):
ext = self._find_ext(data)
else:
ext = None
if format is None:
if ext is not None:
if ext == u'jpg' or ext == u'jpeg':
format = self._FMT_JPEG
elif ext == u'png':
format = self._FMT_PNG
elif ext == u'gif':
format = self._FMT_GIF
else:
format = ext.lower()
elif isinstance(data, bytes):
# infer image type from image data header,
# only if format has not been specified.
if data[:2] == _JPEG:
format = self._FMT_JPEG
# failed to detect format, default png
if format is None:
format = self._FMT_PNG
if format.lower() == 'jpg':
# jpg->jpeg
format = self._FMT_JPEG
self.format = format.lower()
self.embed = embed if embed is not None else (url is None)
if self.embed and self.format not in self._ACCEPTABLE_EMBEDDINGS:
raise ValueError("Cannot embed the '%s' image format" % (self.format))
if self.embed:
self._mimetype = self._MIMETYPES.get(self.format)
self.width = width
self.height = height
self.retina = retina
self.unconfined = unconfined
super(Image, self).__init__(data=data, url=url, filename=filename,
metadata=metadata)
if self.width is None and self.metadata.get('width', {}):
self.width = metadata['width']
if self.height is None and self.metadata.get('height', {}):
self.height = metadata['height']
if retina:
self._retina_shape()
def _retina_shape(self):
"""load pixel-doubled width and height from image data"""
if not self.embed:
return
if self.format == self._FMT_PNG:
w, h = _pngxy(self.data)
elif self.format == self._FMT_JPEG:
w, h = _jpegxy(self.data)
elif self.format == self._FMT_GIF:
w, h = _gifxy(self.data)
else:
# retina only supports png
return
self.width = w // 2
self.height = h // 2
def reload(self):
"""Reload the raw data from file or URL."""
if self.embed:
super(Image,self).reload()
if self.retina:
self._retina_shape()
def _repr_html_(self):
if not self.embed:
width = height = klass = ''
if self.width:
width = ' width="%d"' % self.width
if self.height:
height = ' height="%d"' % self.height
if self.unconfined:
klass = ' class="unconfined"'
return u'<img src="{url}"{width}{height}{klass}/>'.format(
url=self.url,
width=width,
height=height,
klass=klass,
)
def _repr_mimebundle_(self, include=None, exclude=None):
"""Return the image as a mimebundle
Any new mimetype support should be implemented here.
"""
if self.embed:
mimetype = self._mimetype
data, metadata = self._data_and_metadata(always_both=True)
if metadata:
metadata = {mimetype: metadata}
return {mimetype: data}, metadata
else:
return {'text/html': self._repr_html_()}
def _data_and_metadata(self, always_both=False):
"""shortcut for returning metadata with shape information, if defined"""
try:
b64_data = b2a_base64(self.data).decode('ascii')
except TypeError:
raise FileNotFoundError(
"No such file or directory: '%s'" % (self.data))
md = {}
if self.metadata:
md.update(self.metadata)
if self.width:
md['width'] = self.width
if self.height:
md['height'] = self.height
if self.unconfined:
md['unconfined'] = self.unconfined
if md or always_both:
return b64_data, md
else:
return b64_data
def _repr_png_(self):
if self.embed and self.format == self._FMT_PNG:
return self._data_and_metadata()
def _repr_jpeg_(self):
if self.embed and self.format == self._FMT_JPEG:
return self._data_and_metadata()
def _find_ext(self, s):
base, ext = splitext(s)
if not ext:
return base
# `splitext` includes leading period, so we skip it
return ext[1:].lower()
class Video(DisplayObject):
def __init__(self, data=None, url=None, filename=None, embed=False,
mimetype=None, width=None, height=None, html_attributes="controls"):
"""Create a video object given raw data or an URL.
When this object is returned by an input cell or passed to the
display function, it will result in the video being displayed
in the frontend.
Parameters
----------
data : unicode, str or bytes
The raw video data or a URL or filename to load the data from.
Raw data will require passing `embed=True`.
url : unicode
A URL for the video. If you specify `url=`,
the image data will not be embedded.
filename : unicode
Path to a local file containing the video.
Will be interpreted as a local URL unless `embed=True`.
embed : bool
Should the video be embedded using a data URI (True) or be
loaded using a <video> tag (False).
Since videos are large, embedding them should be avoided, if possible.
You must confirm embedding as your intention by passing `embed=True`.
Local files can be displayed with URLs without embedding the content, via::
Video('./video.mp4')
mimetype: unicode
Specify the mimetype for embedded videos.
Default will be guessed from file extension, if available.
width : int
Width in pixels to which to constrain the video in HTML.
If not supplied, defaults to the width of the video.
height : int
Height in pixels to which to constrain the video in html.
If not supplied, defaults to the height of the video.
html_attributes : str
Attributes for the HTML `<video>` block.
Default: `"controls"` to get video controls.
Other examples: `"controls muted"` for muted video with controls,
`"loop autoplay"` for looping autoplaying video without controls.
Examples
--------
::
Video('https://archive.org/download/Sita_Sings_the_Blues/Sita_Sings_the_Blues_small.mp4')
Video('path/to/video.mp4')
Video('path/to/video.mp4', embed=True)
Video('path/to/video.mp4', embed=True, html_attributes="controls muted autoplay")
Video(b'raw-videodata', embed=True)
"""
if isinstance(data, (Path, PurePath)):
data = str(data)
if url is None and isinstance(data, str) and data.startswith(('http:', 'https:')):
url = data
data = None
elif os.path.exists(data):
filename = data
data = None
if data and not embed:
msg = ''.join([
"To embed videos, you must pass embed=True ",
"(this may make your notebook files huge)\n",
"Consider passing Video(url='...')",
])
raise ValueError(msg)
self.mimetype = mimetype
self.embed = embed
self.width = width
self.height = height
self.html_attributes = html_attributes
super(Video, self).__init__(data=data, url=url, filename=filename)
def _repr_html_(self):
width = height = ''
if self.width:
width = ' width="%d"' % self.width
if self.height:
height = ' height="%d"' % self.height
# External URLs and potentially local files are not embedded into the
# notebook output.
if not self.embed:
url = self.url if self.url is not None else self.filename
output = """<video src="{0}" {1} {2} {3}>
Your browser does not support the <code>video</code> element.
</video>""".format(url, self.html_attributes, width, height)
return output
# Embedded videos are base64-encoded.
mimetype = self.mimetype
if self.filename is not None:
if not mimetype:
mimetype, _ = mimetypes.guess_type(self.filename)
with open(self.filename, 'rb') as f:
video = f.read()
else:
video = self.data
if isinstance(video, str):
# unicode input is already b64-encoded
b64_video = video
else:
b64_video = b2a_base64(video).decode('ascii').rstrip()
output = """<video {0} {1} {2}>
<source src="data:{3};base64,{4}" type="{3}">
Your browser does not support the video tag.
</video>""".format(self.html_attributes, width, height, mimetype, b64_video)
return output
def reload(self):
# TODO
pass
def clear_output(wait=False):
"""Clear the output of the current cell receiving output.
Parameters
----------
wait : bool [default: false]
Wait to clear the output until new output is available to replace it."""
from IPython.core.interactiveshell import InteractiveShell
if InteractiveShell.initialized():
InteractiveShell.instance().display_pub.clear_output(wait)
else:
print('\033[2K\r', end='')
sys.stdout.flush()
print('\033[2K\r', end='')
sys.stderr.flush()
@skip_doctest
def set_matplotlib_formats(*formats, **kwargs):
"""Select figure formats for the inline backend. Optionally pass quality for JPEG.
For example, this enables PNG and JPEG output with a JPEG quality of 90%::
In [1]: set_matplotlib_formats('png', 'jpeg', quality=90)
To set this in your config files use the following::
c.InlineBackend.figure_formats = {'png', 'jpeg'}
c.InlineBackend.print_figure_kwargs.update({'quality' : 90})
Parameters
----------
*formats : strs
One or more figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
**kwargs :
Keyword args will be relayed to ``figure.canvas.print_figure``.
"""
from IPython.core.interactiveshell import InteractiveShell
from IPython.core.pylabtools import select_figure_formats
# build kwargs, starting with InlineBackend config
kw = {}
from ipykernel.pylab.config import InlineBackend
cfg = InlineBackend.instance()
kw.update(cfg.print_figure_kwargs)
kw.update(**kwargs)
shell = InteractiveShell.instance()
select_figure_formats(shell, formats, **kw)
@skip_doctest
def set_matplotlib_close(close=True):
"""Set whether the inline backend closes all figures automatically or not.
By default, the inline backend used in the IPython Notebook will close all
matplotlib figures automatically after each cell is run. This means that
plots in different cells won't interfere. Sometimes, you may want to make
a plot in one cell and then refine it in later cells. This can be accomplished
by::
In [1]: set_matplotlib_close(False)
To set this in your config files use the following::
c.InlineBackend.close_figures = False
Parameters
----------
close : bool
Should all matplotlib figures be automatically closed after each cell is
run?
"""
from ipykernel.pylab.config import InlineBackend
cfg = InlineBackend.instance()
cfg.close_figures = close
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