77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
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# -*- coding: utf-8 -*-
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import platform
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import sys
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def user_agent(name, version, extras=None):
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"""
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Returns an internet-friendly user_agent string.
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The majority of this code has been wilfully stolen from the equivalent
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function in Requests.
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:param name: The intended name of the user-agent, e.g. "python-requests".
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:param version: The version of the user-agent, e.g. "0.0.1".
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:param extras: List of two-item tuples that are added to the user-agent
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string.
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:returns: Formatted user-agent string
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:rtype: str
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"""
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try:
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p_system = platform.system()
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p_release = platform.release()
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except IOError:
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p_system = 'Unknown'
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p_release = 'Unknown'
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if extras is None:
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extras = []
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if any(len(extra) != 2 for extra in extras):
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raise ValueError('Extras should be a sequence of two item tuples.')
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format_string = '%s/%s'
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extra_pieces = [
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format_string % (extra_name, extra_version)
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for extra_name, extra_version in extras
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]
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user_agent_pieces = ([format_string % (name, version)] + extra_pieces +
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[_implementation_string(),
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'%s/%s' % (p_system, p_release)])
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return " ".join(user_agent_pieces)
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def _implementation_string():
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"""
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Returns a string that provides both the name and the version of the Python
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implementation currently running. For example, on CPython 2.7.5 it will
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return "CPython/2.7.5".
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This function works best on CPython and PyPy: in particular, it probably
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doesn't work for Jython or IronPython. Future investigation should be done
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to work out the correct shape of the code for those platforms.
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"""
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implementation = platform.python_implementation()
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if implementation == 'CPython':
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implementation_version = platform.python_version()
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elif implementation == 'PyPy':
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implementation_version = '%s.%s.%s' % (sys.pypy_version_info.major,
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sys.pypy_version_info.minor,
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sys.pypy_version_info.micro)
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if sys.pypy_version_info.releaselevel != 'final':
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implementation_version = ''.join([
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implementation_version, sys.pypy_version_info.releaselevel
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])
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elif implementation == 'Jython':
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implementation_version = platform.python_version() # Complete Guess
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elif implementation == 'IronPython':
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implementation_version = platform.python_version() # Complete Guess
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else:
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implementation_version = 'Unknown'
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return "%s/%s" % (implementation, implementation_version)
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