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bpo-42131: Add PEP 451-related methods to zipimport (GH-23187)

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Specifically, find_spec(), create_module(), and exec_module().

Co-authored-by: Nick Coghlan <ncoghlan@gmail.com>
This commit is contained in:
Brett Cannon 2020-11-13 15:14:58 -08:00 • committed by GitHub
parent 9b6934230c
commit d2e94bb084
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6 changed files with 1131 additions and 965 deletions
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34
Lib/zipimport.py
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@ -42,7 +42,7 @@ END_CENTRAL_DIR_SIZE = 22
STRING_END_ARCHIVE = b'PK\x05\x06'
MAX_COMMENT_LEN = (1 << 16) - 1
class zipimporter:
class zipimporter(_bootstrap_external._LoaderBasics):
"""zipimporter(archivepath) -> zipimporter object
Create a new zipimporter instance. 'archivepath' must be a path to
@ -115,6 +115,8 @@ class zipimporter:
full path name if it's possibly a portion of a namespace package,
or None otherwise. The optional 'path' argument is ignored -- it's
there for compatibility with the importer protocol.
Deprecated since Python 3.10. Use find_spec() instead.
"""
mi = _get_module_info(self, fullname)
if mi is not None:
@ -146,9 +148,37 @@ class zipimporter:
instance itself if the module was found, or None if it wasn't.
The optional 'path' argument is ignored -- it's there for compatibility
with the importer protocol.
Deprecated since Python 3.10. Use find_spec() instead.
"""
return self.find_loader(fullname, path)[0]
def find_spec(self, fullname, target=None):
"""Create a ModuleSpec for the specified module.
Returns None if the module cannot be found.
"""
module_info = _get_module_info(self, fullname)
if module_info is not None:
return _bootstrap.spec_from_loader(fullname, self, is_package=module_info)
else:
# Not a module or regular package. See if this is a directory, and
# therefore possibly a portion of a namespace package.
# We're only interested in the last path component of fullname
# earlier components are recorded in self.prefix.
modpath = _get_module_path(self, fullname)
if _is_dir(self, modpath):
# This is possibly a portion of a namespace
# package. Return the string representing its path,
# without a trailing separator.
path = f'{self.archive}{path_sep}{modpath}'
spec = _bootstrap.ModuleSpec(name=fullname, loader=None,
is_package=True)
spec.submodule_search_locations.append(path)
return spec
else:
return None
def get_code(self, fullname):
"""get_code(fullname) -> code object.
@ -237,6 +267,8 @@ class zipimporter:
Load the module specified by 'fullname'. 'fullname' must be the
fully qualified (dotted) module name. It returns the imported
module, or raises ZipImportError if it wasn't found.
Deprecated since Python 3.10. use exec_module() instead.
"""
code, ispackage, modpath = _get_module_code(self, fullname)
mod = sys.modules.get(fullname)