capybara/virtualenv/lib/python2.7/site-packages/setuptools/command/easy_install.py
def _update_zipimporter_cache(normalized_path, cache, updater=None):
    """
    Update zipimporter cache data for a given normalized path.

    Any sub-path entries are processed as well, i.e. those corresponding to zip
    archives embedded in other zip archives.

    Given updater is a callable taking a cache entry key and the original entry
    (after already removing the entry from the cache), and expected to update
    the entry and possibly return a new one to be inserted in its place.
    Returning None indicates that the entry should not be replaced with a new
    one. If no updater is given, the cache entries are simply removed without
    any additional processing, the same as if the updater simply returned None.

    """
    for p in _collect_zipimporter_cache_entries(normalized_path, cache):
        # N.B. pypy's custom zipimport._zip_directory_cache implementation does
        # not support the complete dict interface:
        # * Does not support item assignment, thus not allowing this function
        #    to be used only for removing existing cache entries.
        #  * Does not support the dict.pop() method, forcing us to use the
        #    get/del patterns instead. For more detailed information see the
        #    following links:
        #      https://bitbucket.org/pypa/setuptools/issue/202/more-robust-zipimporter-cache-invalidation#comment-10495960
        #      https://bitbucket.org/pypy/pypy/src/dd07756a34a41f674c0cacfbc8ae1d4cc9ea2ae4/pypy/module/zipimport/interp_zipimport.py#cl-99
        old_entry = cache[p]
        del cache[p]
        new_entry = updater and updater(p, old_entry)
        if new_entry is not None:
            cache[p] = new_entry
def _update_zipimporter_cache(normalized_path, cache, updater=None):
    for p in _collect_zipimporter_cache_entries(normalized_path, cache):
        # N.B. pypy's custom zipimport._zip_directory_cache implementation does
        # not support the complete dict interface:
        # * Does not support item assignment, thus not allowing this function
        #    to be used only for removing existing cache entries.
        #  * Does not support the dict.pop() method, forcing us to use the
        #    get/del patterns instead. For more detailed information see the
        #    following links:
        #      https://bitbucket.org/pypa/setuptools/issue/202/more-robust-zipimporter-cache-invalidation#comment-10495960
        #      https://bitbucket.org/pypy/pypy/src/dd07756a34a41f674c0cacfbc8ae1d4cc9ea2ae4/pypy/module/zipimport/interp_zipimport.py#cl-99
        old_entry = cache[p]
        del cache[p]
        new_entry = updater and updater(p, old_entry)
        if new_entry is not None:
            cache[p] = new_entry
def _update_zipimporter_cache ( normalized_path , cache , updater = None ) : for p in _collect_zipimporter_cache_entries ( normalized_path , cache ) : # N.B. pypy's custom zipimport._zip_directory_cache implementation does # not support the complete dict interface: # * Does not support item assignment, thus not allowing this function #    to be used only for removing existing cache entries. #  * Does not support the dict.pop() method, forcing us to use the #    get/del patterns instead. For more detailed information see the #    following links: #      https://bitbucket.org/pypa/setuptools/issue/202/more-robust-zipimporter-cache-invalidation#comment-10495960 #      https://bitbucket.org/pypy/pypy/src/dd07756a34a41f674c0cacfbc8ae1d4cc9ea2ae4/pypy/module/zipimport/interp_zipimport.py#cl-99 old_entry = cache [ p ] del cache [ p ] new_entry = updater and updater ( p , old_entry ) if new_entry is not None : cache [ p ] = new_entry
Update zipimporter cache data for a given normalized path.

    Any sub-path entries are processed as well, i.e. those corresponding to zip
    archives embedded in other zip archives.

    Given updater is a callable taking a cache entry key and the original entry
    (after already removing the entry from the cache), and expected to update
    the entry and possibly return a new one to be inserted in its place.
    Returning None indicates that the entry should not be replaced with a new
    one. If no updater is given, the cache entries are simply removed without
    any additional processing, the same as if the updater simply returned None.
Update zipimporter cache data for a given normalized path .