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`spec` may be a ``Requirement`` object, or a string containing a URL,
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of a .py file with an unambiguous ``#egg=name-version`` tag (i.e., one
that escapes ``-`` as ``_`` throughout), a trivial ``setup.py`` is
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searched for in the (online) package index as well as the locally
installed packages. If a distribution matching `requirement` is found,
the returned distribution's ``location`` is the value you would have
gotten from calling the ``download()`` method with the matching
distribution's URL or filename. If no matching distribution is found,
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set, development and system eggs (i.e., those using the ``.egg-info``
format) will be ignored.
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Decode HTML entities in the given text.
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A function compatible with Python 2.3-3.3 that will encode
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>>> str(_encode_auth('username%3Apassword'))
'dXNlcm5hbWU6cGFzc3dvcmQ='
Long auth strings should not cause a newline to be inserted.
>>> long_auth = 'username:' + 'password'*10
>>> chr(10) in str(_encode_auth(long_auth))
False
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If the URL indicated appears to be a repository defined in this
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