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Easy Install
------------
A tool for doing automatic download/extract/build of distutils-based Python
packages. For detailed documentation, see the accompanying EasyInstall.txt
file, or visit the `EasyInstall home page`__.
__ https://setuptools.readthedocs.io/en/latest/easy_install.html
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Fix any globally cached `dist_path` related data
`dist_path` should be a path of a newly installed egg distribution (zipped
or unzipped).
sys.path_importer_cache contains finder objects that have been cached when
importing data from the original distribution. Any such finders need to be
cleared since the replacement distribution might be packaged differently,
e.g. a zipped egg distribution might get replaced with an unzipped egg
folder or vice versa. Having the old finders cached may then cause Python
to attempt loading modules from the replacement distribution using an
incorrect loader.
zipimport.zipimporter objects are Python loaders charged with importing
data packaged inside zip archives. If stale loaders referencing the
original distribution, are left behind, they can fail to load modules from
the replacement distribution. E.g. if an old zipimport.zipimporter instance
is used to load data from a new zipped egg archive, it may cause the
operation to attempt to locate the requested data in the wrong location -
one indicated by the original distribution's zip archive directory
information. Such an operation may then fail outright, e.g. report having
read a 'bad local file header', or even worse, it may fail silently &
return invalid data.
zipimport._zip_directory_cache contains cached zip archive directory
information for all existing zipimport.zipimporter instances and all such
instances connected to the same archive share the same cached directory
information.
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all existing zipimport.zipimporter instances instead of having to track
them down and remove them one by one, by updating their shared cached zip
archive directory information. This, of course, assumes that the
replacement distribution is packaged as a zipped egg.
If not asked to fix existing zipimport.zipimporter instances, we still do
our best to clear any remaining zipimport.zipimporter related cached data
that might somehow later get used when attempting to load data from the new
distribution and thus cause such load operations to fail. Note that when
tracking down such remaining stale data, we can not catch every conceivable
usage from here, and we clear only those that we know of and have found to
cause problems if left alive. Any remaining caches should be updated by
whomever is in charge of maintaining them, i.e. they should be ready to
handle us replacing their zip archives with new distributions at runtime.
N( R t _uncacheR� t path_importer_cachet! _replace_zip_directory_cache_datat* _remove_and_clear_zip_directory_cache_data( t dist_pathR� t normalized_path( ( sC /usr/lib/python2.7/site-packages/setuptools/command/easy_install.pyR� � s
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Return zipimporter cache entry keys related to a given normalized path.
Alternative path spellings (e.g. those using different character case or
those using alternative path separators) related to the same path are
included. Any sub-path entries are included as well, i.e. those
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Update zipimporter cache data for a given normalized path.
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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.
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# EASY-INSTALL-ENTRY-SCRIPT: %(spec)r,%(group)r,%(name)r
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import sys
from pkg_resources import load_entry_point
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sys.exit(
load_entry_point(%(spec)r, %(group)r, %(name)r)()
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Select the best ScriptWriter for this environment.
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R t naturalt SETUPTOOLS_LAUNCHER( R� t WindowsExecutableLauncherWriterR9 R� R� ( RN t
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Should _adjust_header use the replaced header?
On non-windows systems, always use. On
Windows systems, only use the replaced header if it resolves
to an executable on the system.
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