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u WorkingSet.run_scriptc c sp i } xc | j D]X } | | j k r+ q n x: | j | D]+ } | | k r9 d | | <| j | Vq9 q9 Wq Wd S( u� Yield distributions for non-duplicate projects in the working set
The yield order is the order in which the items' path entries were
added to the working set.
i N( u entriesu
entry_keysu by_key( u selfu seenu itemu key( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __iter__� s
u WorkingSet.__iter__c C s� | r | j | j | � n | d k r4 | j } n | j j | g � } | j j | j g � } | j | j k rw d S| | j | j <| j | k r� | j | j � n | j | k r� | j | j � n | j | � d S( u� Add `dist` to working set, associated with `entry`
If `entry` is unspecified, it defaults to the ``.location`` of `dist`.
On exit from this routine, `entry` is added to the end of the working
set's ``.entries`` (if it wasn't already present).
`dist` is only added to the working set if it's for a project that
doesn't already have a distribution in the set. If it's added, any
callbacks registered with the ``subscribe()`` method will be called.
N(
u insert_onu entriesu Noneu locationu
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_added_new( u selfu distu entryu insertu keysu keys2( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu add� s u WorkingSet.addc C sV t | � d d d � } i } i } g } x$| rQ| j d � } | | k rU q. n | j | j � } | d k r | j j | j � } | d k r� | d k r� t | j � } n | j | | | � } | | j <| d k r� t | � � q� n | j
| � n | | k r t | | � � n | j | j
| j � d d d � � d | | <q. W| S( u List all distributions needed to (recursively) meet `requirements`
`requirements` must be a sequence of ``Requirement`` objects. `env`,
if supplied, should be an ``Environment`` instance. If
not supplied, it defaults to all distributions available within any
entry or distribution in the working set. `installer`, if supplied,
will be invoked with each requirement that cannot be met by an
already-installed distribution; it should return a ``Distribution`` or
``None``.
Ni i i����i����T( u listu popu getu keyu Noneu by_keyu Environmentu entriesu
best_matchu DistributionNotFoundu appendu VersionConflictu extendu requiresu extrasu True( u selfu requirementsu envu installeru processedu bestu to_activateu requ dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resolve s. &u WorkingSet.resolvec C sP t | � } | j � i } i } | d k rJ t | j � } | | 7} n
| | } | j g � } t t | j | � � x� | D]� }
x� | |
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t j |
� � Pq� Wq� Wt | � } | j � | | f S( ub Find all activatable distributions in `plugin_env`
Example usage::
distributions, errors = working_set.find_plugins(
Environment(plugin_dirlist)
)
map(working_set.add, distributions) # add plugins+libs to sys.path
print 'Could not load', errors # display errors
The `plugin_env` should be an ``Environment`` instance that contains
only distributions that are in the project's "plugin directory" or
directories. The `full_env`, if supplied, should be an ``Environment``
contains all currently-available distributions. If `full_env` is not
supplied, one is created automatically from the ``WorkingSet`` this
method is called on, which will typically mean that every directory on
``sys.path`` will be scanned for distributions.
`installer` is a standard installer callback as used by the
``resolve()`` method. The `fallback` flag indicates whether we should
attempt to resolve older versions of a plugin if the newest version
cannot be resolved.
This method returns a 2-tuple: (`distributions`, `error_info`), where
`distributions` is a list of the distributions found in `plugin_env`
that were loadable, along with any other distributions that are needed
to resolve their dependencies. `error_info` is a dictionary mapping
unloadable plugin distributions to an exception instance describing the
error that occurred. Usually this will be a ``DistributionNotFound`` or
``VersionConflict`` instance.
i N( u listu sortu Noneu Environmentu entriesu __class__u mapu addu as_requirementu resolveu ResolutionErroru sysu exc_infou updateu dictu fromkeys( u selfu
plugin_envu full_envu installeru fallbacku plugin_projectsu
error_infou
distributionsu envu
shadow_setu project_nameu distu requ resolveesu v( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu find_pluginsA s6 "
u WorkingSet.find_pluginsc G s7 | j t | � � } x | D] } | j | � q W| S( u� Ensure that distributions matching `requirements` are activated
`requirements` must be a string or a (possibly-nested) sequence
thereof, specifying the distributions and versions required. The
return value is a sequence of the distributions that needed to be
activated to fulfill the requirements; all relevant distributions are
included, even if they were already activated in this working set.
( u resolveu parse_requirementsu add( u selfu requirementsu neededu dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu require� s
u WorkingSet.requirec C sB | | j k r d S| j j | � x | D] } | | � q* Wd S( uA Invoke `callback` for all distributions (including existing ones)N( u callbacksu append( u selfu callbacku dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu subscribe� s
u WorkingSet.subscribec C s" x | j D] } | | � q
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_added_new� s u WorkingSet._added_newc C s< | j d d � | j j � | j j � | j d d � f S( N( u entriesu
entry_keysu copyu by_keyu callbacks( u self( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __getstate__� s (u WorkingSet.__getstate__c C sZ | \ } } } } | d d � | _ | j � | _ | j � | _ | d d � | _ d S( N( u entriesu copyu
entry_keysu by_keyu callbacks( u selfu e_k_b_cu entriesu keysu by_keyu callbacks( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __setstate__� s
u WorkingSet.__setstate__NT( u __name__u
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WorkingSet� s"
/M c B s� | Ee Z d Z d Z d e � e d d � Z d d � Z d d � Z d d d � Z
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d d d � Z d d � Z d d � Z d d � Z d S( u Environmentu5 Searchable snapshot of distributions on a search pathc C s5 i | _ i | _ | | _ | | _ | j | � d S( u! Snapshot distributions available on a search path
Any distributions found on `search_path` are added to the environment.
`search_path` should be a sequence of ``sys.path`` items. If not
supplied, ``sys.path`` is used.
`platform` is an optional string specifying the name of the platform
that platform-specific distributions must be compatible with. If
unspecified, it defaults to the current platform. `python` is an
optional string naming the desired version of Python (e.g. ``'3.3'``);
it defaults to the current version.
You may explicitly set `platform` (and/or `python`) to ``None`` if you
wish to map *all* distributions, not just those compatible with the
running platform or Python version.
N( u _distmapu _cacheu platformu pythonu scan( u selfu search_pathu platformu python( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __init__� s
u Environment.__init__c C sC | j d k s0 | j d k s0 | j | j k oB t | j | j � S( u� Is distribution `dist` acceptable for this environment?
The distribution must match the platform and python version
requirements specified when this environment was created, or False
is returned.
N( u pythonu Noneu
py_versionu compatible_platformsu platform( u selfu dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu can_add� s u Environment.can_addc C s | j | j j | � d S( u" Remove `dist` from the environmentN( u _distmapu keyu remove( u selfu dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu remove� s u Environment.removec C sQ | d k r t j } n x2 | D]* } x! t | � D] } | j | � q2 Wq Wd S( ud Scan `search_path` for distributions usable in this environment
Any distributions found are added to the environment.
`search_path` should be a sequence of ``sys.path`` items. If not
supplied, ``sys.path`` is used. Only distributions conforming to
the platform/python version defined at initialization are added.
N( u Noneu sysu pathu find_distributionsu add( u selfu search_pathu itemu dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu scan� s
u Environment.scanc C s� y | j | SWn1 t k
rB | j � } | | j k r> g SYn X| | j k rw | j | } | j | <t | � n | j | S( uK Return a newest-to-oldest list of distributions for `project_name`
( u _cacheu KeyErroru loweru _distmapu _sort_dists( u selfu project_nameu dists( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __getitem__� s
u Environment.__getitem__c C s | j | � r{ | j � r{ | j j | j g � } | | k r{ | j | � | j | j k rx t | j | j � qx q{ n d S( u< Add `dist` if we ``can_add()`` it and it isn't already addedN( u can_addu has_versionu _distmapu
setdefaultu keyu appendu _cacheu _sort_dists( u selfu distu dists( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu add s
u Environment.addc C sW | j | � } | d k r | Sx% | | j D] } | | k r- | Sq- W| j | | � S( u� Find distribution best matching `req` and usable on `working_set`
This calls the ``find(req)`` method of the `working_set` to see if a
suitable distribution is already active. (This may raise
``VersionConflict`` if an unsuitable version of the project is already
active in the specified `working_set`.) If a suitable distribution
isn't active, this method returns the newest distribution in the
environment that meets the ``Requirement`` in `req`. If no suitable
distribution is found, and `installer` is supplied, then the result of
calling the environment's ``obtain(req, installer)`` method will be
returned.
N( u findu Noneu keyu obtain( u selfu requ working_setu installeru dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu
best_match
s
u Environment.best_matchc C s | d k r | | � Sd S( u� Obtain a distribution matching `requirement` (e.g. via download)
Obtain a distro that matches requirement (e.g. via download). In the
base ``Environment`` class, this routine just returns
``installer(requirement)``, unless `installer` is None, in which case
None is returned instead. This method is a hook that allows subclasses
to attempt other ways of obtaining a distribution before falling back
to the `installer` argument.N( u None( u selfu requirementu installer( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu obtain s u Environment.obtainc c s0 x) | j j � D] } | | r | Vq q Wd S( u= Yield the unique project names of the available distributionsN( u _distmapu keys( u selfu key( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __iter__+ s
u Environment.__iter__c C s{ t | t � r | j | � nX t | t � rd xF | D]( } x | | D] } | j | � qF Wq5 Wn t d | f � � | S( u2 In-place addition of a distribution or environmentu Can't add %r to environment( u
isinstanceu Distributionu addu Environmentu TypeError( u selfu otheru projectu dist( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __iadd__0 s
u Environment.__iadd__c C s@ | j g d d d d �} x | | f D] } | | 7} q( W| S( u4 Add an environment or distribution to an environmentu platformu pythonN( u __class__u None( u selfu otheru newu env( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __add__< s u Environment.__add__N( u __name__u
__module__u __qualname__u __doc__u Noneu get_supported_platformu PY_MAJORu __init__u can_addu removeu scanu __getitem__u addu
best_matchu obtainu __iter__u __iadd__u __add__( u
__locals__( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu Environment� s c B s | Ee Z d Z d Z d S( u ExtractionErroruT An error occurred extracting a resource
The following attributes are available from instances of this exception:
manager
The resource manager that raised this exception
cache_path
The base directory for resource extraction
original_error
The exception instance that caused extraction to fail
N( u __name__u
__module__u __qualname__u __doc__( u
__locals__( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu ExtractionErrorG s
c B s� | Ee Z d Z d Z d Z d d � Z d d � Z d d � Z d d � Z d
d � Z
d d
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f d d � Z e d d � � Z d d � Z d d � Z d d d � Z d S( u ResourceManageru' Manage resource extraction and packagesc C s
i | _ d S( N( u cached_files( u self( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __init__[ s u ResourceManager.__init__c C s t | � j | � S( u Does the named resource exist?( u get_provideru has_resource( u selfu package_or_requirementu
resource_name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resource_exists^ s u ResourceManager.resource_existsc C s t | � j | � S( u, Is the named resource an existing directory?( u get_provideru resource_isdir( u selfu package_or_requirementu
resource_name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resource_isdirb s u ResourceManager.resource_isdirc C s t | � j | | � S( u4 Return a true filesystem path for specified resource( u get_provideru get_resource_filename( u selfu package_or_requirementu
resource_name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resource_filenameh s u! ResourceManager.resource_filenamec C s t | � j | | � S( u9 Return a readable file-like object for specified resource( u get_provideru get_resource_stream( u selfu package_or_requirementu
resource_name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resource_streamn s u ResourceManager.resource_streamc C s t | � j | | � S( u% Return specified resource as a string( u get_provideru get_resource_string( u selfu package_or_requirementu
resource_name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resource_stringt s u ResourceManager.resource_stringc C s t | � j | � S( u1 List the contents of the named resource directory( u get_provideru resource_listdir( u selfu package_or_requirementu
resource_name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu resource_listdirz s u ResourceManager.resource_listdirc C s] t j � d } | j p t � } t d | | f � } | | _ | | _ | | _ | � d S( u5 Give an error message for problems extracting file(s)i u} Can't extract file(s) to egg cache
The following error occurred while trying to extract file(s) to the Python egg
cache:
%s
The Python egg cache directory is currently set to:
%s
Perhaps your account does not have write access to this directory? You can
change the cache directory by setting the PYTHON_EGG_CACHE environment
variable to point to an accessible directory.
N( u sysu exc_infou extraction_pathu get_default_cacheu ExtractionErroru manageru
cache_pathu original_error( u selfu old_excu
cache_pathu err( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu extraction_error� s u ResourceManager.extraction_errorc
C so | j p t � } t j j | | d | � } y t | � Wn | j � Yn X| j | � d | j | <| S( u� Return absolute location in cache for `archive_name` and `names`
The parent directory of the resulting path will be created if it does
not already exist. `archive_name` should be the base filename of the
enclosing egg (which may not be the name of the enclosing zipfile!),
including its ".egg" extension. `names`, if provided, should be a
sequence of path name parts "under" the egg's extraction location.
This method should only be called by resource providers that need to
obtain an extraction location, and only for names they intend to
extract, as it tracks the generated names for possible cleanup later.
u -tmpi ( u extraction_pathu get_default_cacheu osu pathu joinu _bypass_ensure_directoryu extraction_erroru _warn_unsafe_extraction_pathu cached_files( u selfu archive_nameu namesu extract_pathu target_path( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu get_cache_path� s
u ResourceManager.get_cache_pathc C sw t j d k r* | j t j d � r* d St j | � j } | t j @sV | t j @rs d | } t j | t
� n d S( uN
If the default extraction path is overridden and set to an insecure
location, such as /tmp, it opens up an opportunity for an attacker to
replace an extracted file with an unauthorized payload. Warn the user
if a known insecure location is used.
See Distribute #375 for more details.
u ntu windirNu� %s is writable by group/others and vulnerable to attack when used with get_resource_filename. Consider a more secure location (set with .set_extraction_path or the PYTHON_EGG_CACHE environment variable).( u osu nameu
startswithu environu statu st_modeu S_IWOTHu S_IWGRPu warningsu warnu UserWarning( u pathu modeu msg( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu _warn_unsafe_extraction_path� s
&u, ResourceManager._warn_unsafe_extraction_pathc C s@ t j d k r< t j | � j d Bd @} t j | | � n d S( u4 Perform any platform-specific postprocessing of `tempname`
This is where Mac header rewrites should be done; other platforms don't
have anything special they should do.
Resource providers should call this method ONLY after successfully
extracting a compressed resource. They must NOT call it on resources
that are already in the filesystem.
`tempname` is the current (temporary) name of the file, and `filename`
is the name it will be renamed to by the caller after this routine
returns.
u posixim i� N( u osu nameu statu st_modeu chmod( u selfu tempnameu filenameu mode( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu postprocess� s u ResourceManager.postprocessc C s% | j r t d � � n | | _ d S( u� Set the base path where resources will be extracted to, if needed.
If you do not call this routine before any extractions take place, the
path defaults to the return value of ``get_default_cache()``. (Which
is based on the ``PYTHON_EGG_CACHE`` environment variable, with various
platform-specific fallbacks. See that routine's documentation for more
details.)
Resources are extracted to subdirectories of this path based upon
information given by the ``IResourceProvider``. You may set this to a
temporary directory, but then you must call ``cleanup_resources()`` to
delete the extracted files when done. There is no guarantee that
``cleanup_resources()`` will be able to remove all extracted files.
(Note: you may not change the extraction path for a given resource
manager once resources have been extracted, unless you first call
``cleanup_resources()``.)
u5 Can't change extraction path, files already extractedN( u cached_filesu
ValueErroru extraction_path( u selfu path( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu set_extraction_path� s u# ResourceManager.set_extraction_pathc C s d S( uB
Delete all extracted resource files and directories, returning a list
of the file and directory names that could not be successfully removed.
This function does not have any concurrency protection, so it should
generally only be called when the extraction path is a temporary
directory exclusive to a single process. This method is not
automatically called; you must call it explicitly or register it as an
``atexit`` function if you wish to ensure cleanup of a temporary
directory used for extractions.
N( ( u selfu force( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu cleanup_resources� s u! ResourceManager.cleanup_resourcesNF( u __name__u
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__locals__( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu ResourceManagerW s c C s y t j d SWn t k
r# Yn Xt j d k rC t j j d � Sd } d d | f d | f d | f d d | f g } x� | D]� \ } } d } xn | D]5 } | t j k r� t j j | t j | � } q� Pq� W| r� t j j | | � } n t j j | d � Sq� Wt d
� � d S( u Determine the default cache location
This returns the ``PYTHON_EGG_CACHE`` environment variable, if set.
Otherwise, on Windows, it returns a "Python-Eggs" subdirectory of the
"Application Data" directory. On all other systems, it's "~/.python-eggs".
u PYTHON_EGG_CACHEu ntu ~/.python-eggsu Application Datau APPDATAu USERPROFILEu HOMEDRIVEu HOMEPATHu HOMEu WINDIRu u Python-Eggsu3 Please set the PYTHON_EGG_CACHE enviroment variableN( u APPDATA( ( u APPDATAN( u USERPROFILE( u HOMEDRIVEu HOMEPATH( u HOMEPATH( u HOME( ( u HOMEN( u WINDIR( u osu environu KeyErroru nameu pathu
expanduseru Noneu joinu RuntimeError( u app_datau app_homesu keysu subdiru dirnameu key( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu get_default_cache s0
c C s t j d d | � S( u� Convert an arbitrary string to a standard distribution name
Any runs of non-alphanumeric/. characters are replaced with a single '-'.
u [^A-Za-z0-9.]+u -( u reu sub( u name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu safe_name0 s c C s% | j d d � } t j d d | � S( u� Convert an arbitrary string to a standard version string
Spaces become dots, and all other non-alphanumeric characters become
dashes, with runs of multiple dashes condensed to a single dash.
u u .u [^A-Za-z0-9.]+u -( u replaceu reu sub( u version( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu safe_version8 s c C s t j d d | � j � S( u� Convert an arbitrary string to a standard 'extra' name
Any runs of non-alphanumeric characters are replaced with a single '_',
and the result is always lowercased.
u [^A-Za-z0-9.]+u _( u reu subu lower( u extra( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu
safe_extraB s c C s | j d d � S( u| Convert a project or version name to its filename-escaped form
Any '-' characters are currently replaced with '_'.
u -u _( u replace( u name( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu to_filenameK s u nameu osu platformu sysu versionu machineu python_implementationu python_versionu python_full_versionu extrac C s t j S( N( u osu name( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>Y s u os_namec C s t j S( N( u sysu platform( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>Z s u sys_platformc C s t j j � d S( Ni ( u sysu versionu split( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>[ s c C s d t j d t j d f S( Nu %s.%si i ( u sysu version_info( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>\ s c C s
t d � S( Nu version( u _platinfo( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>] s u platform_versionc C s
t d � S( Nu machine( u _platinfo( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>^ s u platform_machinec C s t d � p t � S( Nu python_implementation( u _platinfou _pyimp( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>_ s c
C sB y d d l } Wn t k
r( d SYn Xt | | d d � � � S( Ni u c S s d S( Nu ( ( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu <lambda>g s u _platinfo.<locals>.<lambda>( u platformu ImportErroru getattr( u attru platform( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu _platinfob s
u _platinfoc C sD t j d k r d St j j d � r) d Sd t j k r< d Sd Sd S( Nu cliu
IronPythonu javau Jythonu __pypy__u PyPyu CPython( u sysu platformu
startswithu builtin_module_names( ( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu _pyimpi s u _pyimpc C sE i d d 6d d 6} d | _ d | _ | j | j | j � | _ | S( u�
Given a SyntaxError from a marker evaluation, normalize the error message:
- Remove indications of filename and line number.
- Replace platform-specific error messages with standard error messages.
u invalid syntaxu unexpected EOF while parsingu parenthesis is never closedN( u Noneu filenameu linenou getu msg( u excu subs( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu normalize_exceptions s
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This builds a similar dictionary to the zipimport directory
caches. However instead of tuples, ZipInfo objects are stored.
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on pypy it is the same (one reason why distribute did work
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* [5] - (zipinfo.date_time[0] - 1980) << 9 |
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* [7] - zipinfo.CRC
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1 c B sJ | Ee Z d Z d Z d d � Z d d � Z d d � Z d d � Z d
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the provided location.
c C s
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c B s& | Ee Z d Z d Z d d � Z d S( u PathMetadatauq Metadata provider for egg directories
Usage::
# Development eggs:
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metadata = PathMetadata(base_dir, egg_info)
dist_name = os.path.splitext(os.path.basename(egg_info))[0]
dist = Distribution(basedir,project_name=dist_name,metadata=metadata)
# Unpacked egg directories:
egg_path = "/path/to/PackageName-ver-pyver-etc.egg"
metadata = PathMetadata(egg_path, os.path.join(egg_path,'EGG-INFO'))
dist = Distribution.from_filename(egg_path, metadata=metadata)
c C s | | _ | | _ d S( N( u module_pathu egg_info( u selfu pathu egg_info( ( u& /tmp/pip-k8wh6o-build/pkg_resources.pyu __init__� s u PathMetadata.__init__N( u __name__u
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handler), and `namespace_handler` is a callable like this::
def namespace_handler(importer,path_entry,moduleName,module):
# return a path_entry to use for child packages
Namespace handlers are only called if the importer object has already
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