Uploaded Test files

venv/Lib/site-packages/ipython_genutils/py3compat.py

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+# coding: utf-8
+"""Compatibility tricks for Python 3. Mainly to do with unicode."""
+import functools
+import os
+import sys
+import re
+import shutil
+import types
+
+from .encoding import DEFAULT_ENCODING
+
+def no_code(x, encoding=None):
+    return x
+
+def decode(s, encoding=None):
+    encoding = encoding or DEFAULT_ENCODING
+    return s.decode(encoding, "replace")
+
+def encode(u, encoding=None):
+    encoding = encoding or DEFAULT_ENCODING
+    return u.encode(encoding, "replace")
+
+
+def cast_unicode(s, encoding=None):
+    if isinstance(s, bytes):
+        return decode(s, encoding)
+    return s
+
+def cast_bytes(s, encoding=None):
+    if not isinstance(s, bytes):
+        return encode(s, encoding)
+    return s
+
+def buffer_to_bytes(buf):
+    """Cast a buffer or memoryview object to bytes"""
+    if isinstance(buf, memoryview):
+        return buf.tobytes()
+    if not isinstance(buf, bytes):
+        return bytes(buf)
+    return buf
+
+def _modify_str_or_docstring(str_change_func):
+    @functools.wraps(str_change_func)
+    def wrapper(func_or_str):
+        if isinstance(func_or_str, string_types):
+            func = None
+            doc = func_or_str
+        else:
+            func = func_or_str
+            doc = func.__doc__
+        
+        doc = str_change_func(doc)
+        
+        if func:
+            func.__doc__ = doc
+            return func
+        return doc
+    return wrapper
+
+def safe_unicode(e):
+    """unicode(e) with various fallbacks. Used for exceptions, which may not be
+    safe to call unicode() on.
+    """
+    try:
+        return unicode_type(e)
+    except UnicodeError:
+        pass
+
+    try:
+        return str_to_unicode(str(e))
+    except UnicodeError:
+        pass
+
+    try:
+        return str_to_unicode(repr(e))
+    except UnicodeError:
+        pass
+
+    return u'Unrecoverably corrupt evalue'
+
+# shutil.which from Python 3.4
+def _shutil_which(cmd, mode=os.F_OK | os.X_OK, path=None):
+    """Given a command, mode, and a PATH string, return the path which
+    conforms to the given mode on the PATH, or None if there is no such
+    file.
+
+    `mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result
+    of os.environ.get("PATH"), or can be overridden with a custom search
+    path.
+    
+    This is a backport of shutil.which from Python 3.4
+    """
+    # Check that a given file can be accessed with the correct mode.
+    # Additionally check that `file` is not a directory, as on Windows
+    # directories pass the os.access check.
+    def _access_check(fn, mode):
+        return (os.path.exists(fn) and os.access(fn, mode)
+                and not os.path.isdir(fn))
+
+    # If we're given a path with a directory part, look it up directly rather
+    # than referring to PATH directories. This includes checking relative to the
+    # current directory, e.g. ./script
+    if os.path.dirname(cmd):
+        if _access_check(cmd, mode):
+            return cmd
+        return None
+
+    if path is None:
+        path = os.environ.get("PATH", os.defpath)
+    if not path:
+        return None
+    path = path.split(os.pathsep)
+
+    if sys.platform == "win32":
+        # The current directory takes precedence on Windows.
+        if not os.curdir in path:
+            path.insert(0, os.curdir)
+
+        # PATHEXT is necessary to check on Windows.
+        pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
+        # See if the given file matches any of the expected path extensions.
+        # This will allow us to short circuit when given "python.exe".
+        # If it does match, only test that one, otherwise we have to try
+        # others.
+        if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
+            files = [cmd]
+        else:
+            files = [cmd + ext for ext in pathext]
+    else:
+        # On other platforms you don't have things like PATHEXT to tell you
+        # what file suffixes are executable, so just pass on cmd as-is.
+        files = [cmd]
+
+    seen = set()
+    for dir in path:
+        normdir = os.path.normcase(dir)
+        if not normdir in seen:
+            seen.add(normdir)
+            for thefile in files:
+                name = os.path.join(dir, thefile)
+                if _access_check(name, mode):
+                    return name
+    return None
+
+import platform
+if sys.version_info[0] >= 3 or platform.python_implementation() == 'IronPython':
+    str_to_unicode = no_code
+    unicode_to_str = no_code
+    str_to_bytes = encode
+    bytes_to_str = decode
+    cast_bytes_py2 = no_code
+    cast_unicode_py2 = no_code
+    buffer_to_bytes_py2 = no_code
+    
+    string_types = (str,)
+    unicode_type = str
+else:
+    str_to_unicode = decode
+    unicode_to_str = encode
+    str_to_bytes = no_code
+    bytes_to_str = no_code
+    cast_bytes_py2 = cast_bytes
+    cast_unicode_py2 = cast_unicode
+    buffer_to_bytes_py2 = buffer_to_bytes
+    
+    string_types = (str, unicode)
+    unicode_type = unicode
+
+if sys.version_info[0] >= 3:
+    PY3 = True
+    
+    # keep reference to builtin_mod because the kernel overrides that value
+    # to forward requests to a frontend.
+    def input(prompt=''):
+        return builtin_mod.input(prompt)
+    
+    builtin_mod_name = "builtins"
+    import builtins as builtin_mod
+        
+    which = shutil.which
+    
+    def isidentifier(s, dotted=False):
+        if dotted:
+            return all(isidentifier(a) for a in s.split("."))
+        return s.isidentifier()
+
+    xrange = range
+    def iteritems(d): return iter(d.items())
+    def itervalues(d): return iter(d.values())
+    getcwd = os.getcwd
+    
+    MethodType = types.MethodType
+
+    def execfile(fname, glob, loc=None, compiler=None):
+        loc = loc if (loc is not None) else glob
+        with open(fname, 'rb') as f:
+            compiler = compiler or compile
+            exec(compiler(f.read(), fname, 'exec'), glob, loc)
+    
+    # Refactor print statements in doctests.
+    _print_statement_re = re.compile(r"\bprint (?P<expr>.*)$", re.MULTILINE)
+    def _print_statement_sub(match):
+        expr = match.groups('expr')
+        return "print(%s)" % expr
+    
+    @_modify_str_or_docstring
+    def doctest_refactor_print(doc):
+        """Refactor 'print x' statements in a doctest to print(x) style. 2to3
+        unfortunately doesn't pick up on our doctests.
+        
+        Can accept a string or a function, so it can be used as a decorator."""
+        return _print_statement_re.sub(_print_statement_sub, doc)
+    
+    # Abstract u'abc' syntax:
+    @_modify_str_or_docstring
+    def u_format(s):
+        """"{u}'abc'" --> "'abc'" (Python 3)
+        
+        Accepts a string or a function, so it can be used as a decorator."""
+        return s.format(u='')
+    
+    def get_closure(f):
+        """Get a function's closure attribute"""
+        return f.__closure__
+
+else:
+    PY3 = False
+    
+    # keep reference to builtin_mod because the kernel overrides that value
+    # to forward requests to a frontend.
+    def input(prompt=''):
+        return builtin_mod.raw_input(prompt)
+    
+    builtin_mod_name = "__builtin__"
+    import __builtin__ as builtin_mod
+    
+    import re
+    _name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$")
+    def isidentifier(s, dotted=False):
+        if dotted:
+            return all(isidentifier(a) for a in s.split("."))
+        return bool(_name_re.match(s))
+    
+    xrange = xrange
+    def iteritems(d): return d.iteritems()
+    def itervalues(d): return d.itervalues()
+    getcwd = os.getcwdu
+
+    def MethodType(func, instance):
+        return types.MethodType(func, instance, type(instance))
+    
+    def doctest_refactor_print(func_or_str):
+        return func_or_str
+
+    def get_closure(f):
+        """Get a function's closure attribute"""
+        return f.func_closure
+    
+    which = _shutil_which
+
+    # Abstract u'abc' syntax:
+    @_modify_str_or_docstring
+    def u_format(s):
+        """"{u}'abc'" --> "u'abc'" (Python 2)
+        
+        Accepts a string or a function, so it can be used as a decorator."""
+        return s.format(u='u')
+
+    if sys.platform == 'win32':
+        def execfile(fname, glob=None, loc=None, compiler=None):
+            loc = loc if (loc is not None) else glob
+            scripttext = builtin_mod.open(fname).read()+ '\n'
+            # compile converts unicode filename to str assuming
+            # ascii. Let's do the conversion before calling compile
+            if isinstance(fname, unicode):
+                filename = unicode_to_str(fname)
+            else:
+                filename = fname
+            compiler = compiler or compile
+            exec(compiler(scripttext, filename, 'exec'), glob, loc)
+
+    else:
+        def execfile(fname, glob=None, loc=None, compiler=None):
+            if isinstance(fname, unicode):
+                filename = fname.encode(sys.getfilesystemencoding())
+            else:
+                filename = fname
+            where = [ns for ns in [glob, loc] if ns is not None]
+            if compiler is None:
+                builtin_mod.execfile(filename, *where)
+            else:
+                scripttext = builtin_mod.open(fname).read().rstrip() + '\n'
+                exec(compiler(scripttext, filename, 'exec'), glob, loc)
+
+
+def annotate(**kwargs):
+    """Python 3 compatible function annotation for Python 2."""
+    if not kwargs:
+        raise ValueError('annotations must be provided as keyword arguments')
+    def dec(f):
+        if hasattr(f, '__annotations__'):
+            for k, v in kwargs.items():
+                f.__annotations__[k] = v
+        else:
+            f.__annotations__ = kwargs
+        return f
+    return dec
+
+
+# Parts below taken from six:
+# Copyright (c) 2010-2013 Benjamin Peterson
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    return meta("_NewBase", bases, {})