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Filename globbing utility. Mostly a copy of `glob` from Python 3.5.
Changes include:
* `yield from` and PEP3102 `*` removed.
* `bytes` changed to `six.binary_type`.
* Hidden files are not ignored.
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The pattern may contain simple shell-style wildcards a la
fnmatch. However, unlike fnmatch, filenames starting with a
dot are special cases that are not matched by '*' and '?'
patterns.
If recursive is true, the pattern '**' will match any files and
zero or more directories and subdirectories.
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fnmatch. However, unlike fnmatch, filenames starting with a
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c C sV t j j | � \ } } t | t � r< t j d | � } n t j d | � } | | S( s# Escape all special characters.
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