Python sys.path_hooks方法代码示例

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def test_load_with_path_hook(self):

    class DummyPathHook(object):

      def __init__(self, path):
        if path != 'dummy/path':
          raise ImportError

      def find_module(self, unused_fullname):
        return self

      def load_module(self, fullname):
        return imp.new_module('fake name: %s' % fullname)

    self.test_policies['distutils.util'] = sandbox.ModuleOverridePolicy(
        None, [], {}, default_pass_through=True)
    sys.path_hooks = [DummyPathHook]
    util = self.hook.load_module('distutils.util')
    self.assertEqual('fake name: distutils.util', util.__name__) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def test_load_with_path_hook_cant_find(self):

    class DummyPathHook(object):

      def __init__(self, path):
        if path != 'dummy/path':
          raise ImportError

      def find_module(self, unused_fullname):
        return None

      def load_module(self, fullname):
        raise ImportError

    self.test_policies['distutils.util'] = sandbox.ModuleOverridePolicy(
        None, [], {}, default_pass_through=True)
    sys.path_hooks = [DummyPathHook]
    util = self.hook.load_module('distutils.util')
    self.assertEqual('distutils.util', util.__name__) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def __init__(self, modules):
    """Initializer.

    Args:
      modules: Dictionary containing monitored modules.
    """
    self._modules = modules

    self._default_modules = self._modules.copy()

    self._save_path_hooks = sys.path_hooks[:]








    self._modification_times = {}


    self._dirty = True 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def test_path_hooks(self):
        import toimport
        def prepare(f):
            sys.path_importer_cache = {}
            sys.path_hooks = [f]
            if 'toimport' in sys.modules: del sys.modules['toimport']
        
        def hook(*args):  raise Exception('hello')
        prepare(hook)
        def f(): import toimport
        self.assertRaisesMessage(Exception, 'hello', f)

        # ImportError shouldn't propagate out
        def hook(*args):  raise ImportError('foo')
        prepare(hook)
        f()

        # returning none should be ok
        def hook(*args): pass
        prepare(hook)
        f()
        
        sys.path_hooks = [] 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def get_importer(path_item):
    """Retrieve a PEP 302 importer for the given path item

    The returned importer is cached in sys.path_importer_cache
    if it was newly created by a path hook.

    The cache (or part of it) can be cleared manually if a
    rescan of sys.path_hooks is necessary.
    """
    try:
        importer = sys.path_importer_cache[path_item]
    except KeyError:
        for path_hook in sys.path_hooks:
            try:
                importer = path_hook(path_item)
                sys.path_importer_cache.setdefault(path_item, importer)
                break
            except ImportError:
                pass
        else:
            importer = None
    return importer 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def test_None_on_sys_path(self):
        # Putting None in sys.path[0] caused an import regression from Python
        # 3.2: http://bugs.python.org/issue16514
        new_path = sys.path[:]
        new_path.insert(0, None)
        new_path_importer_cache = sys.path_importer_cache.copy()
        new_path_importer_cache.pop(None, None)
        new_path_hooks = [zipimport.zipimporter,
                          self.machinery.FileFinder.path_hook(
                              *self.importlib._bootstrap_external._get_supported_file_loaders())]
        missing = object()
        email = sys.modules.pop('email', missing)
        try:
            with util.import_state(meta_path=sys.meta_path[:],
                                   path=new_path,
                                   path_importer_cache=new_path_importer_cache,
                                   path_hooks=new_path_hooks):
                module = self.importlib.import_module('email')
                self.assertIsInstance(module, ModuleType)
        finally:
            if email is not missing:
                sys.modules['email'] = email 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def test_finder_with_failing_find_module(self):
        # PathEntryFinder with find_module() defined should work.
        # Issue #20763.
        class Finder:
            path_location = 'test_finder_with_find_module'
            def __init__(self, path):
                if path != self.path_location:
                    raise ImportError

            @staticmethod
            def find_module(fullname):
                return None


        with util.import_state(path=[Finder.path_location]+sys.path[:],
                               path_hooks=[Finder]):
            self.machinery.PathFinder.find_spec('importlib') 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def get_importer(path_item):
    """Retrieve a finder for the given path item

    The returned finder is cached in sys.path_importer_cache
    if it was newly created by a path hook.

    The cache (or part of it) can be cleared manually if a
    rescan of sys.path_hooks is necessary.
    """
    try:
        importer = sys.path_importer_cache[path_item]
    except KeyError:
        for path_hook in sys.path_hooks:
            try:
                importer = path_hook(path_item)
                sys.path_importer_cache.setdefault(path_item, importer)
                break
            except ImportError:
                pass
        else:
            importer = None
    return importer 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def setUp(self):
        super(ImpTest, self).setUp()

        self._testdir = "ImpTest"
        self._imptestdir = os.path.join(self.test_dir, self._testdir)
        self._f_init = os.path.join(self._imptestdir, "__init__.py")
        self._f_module  = os.path.join(self._imptestdir, "imptestmod.py")

        self.temp_name = ["os",
                    "os.P_WAIT",
                    "os.chmod",
                    "sys.path",
                    "xxxx"
                    ]

        # backup path values
        self.__path = sys.path[:]
        self.__path_hooks = sys.path_hooks[:]
        self.__meta_path = sys.meta_path[:] 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def get_sys_path_hooks(self):
        return id(sys.path_hooks), sys.path_hooks, sys.path_hooks[:] 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def restore_sys_path_hooks(self, saved_hooks):
        sys.path_hooks = saved_hooks[1]
        sys.path_hooks[:] = saved_hooks[2] 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def setUp(self):
    super(ModuleOverrideImportHookTest, self).setUp()
    self.test_policies = {}
    self.path = sys.path[:]
    self.hook = sandbox.ModuleOverrideImportHook(self.test_policies)
    sys.path_importer_cache = {}
    sys.modules.pop('distutils', None)
    __import__('distutils').__path__.insert(0, 'dummy/path')
    sys.modules.pop('distutils.util', None)
    sys.modules.pop('thread', None)
    self.imported_modules = set(sys.modules)
    self.path_hooks = sys.path_hooks 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def tearDown(self):
    sys.path_hooks = self.path_hooks
    sys.path_importer_cache = {}
    sys.path = self.path
    added_modules = set(sys.modules) - self.imported_modules
    for name in added_modules:
      del sys.modules[name]
    distutils_modules = [module for module in sys.modules if
                         module.startswith('distutils')]
    for name in distutils_modules:
      del sys.modules[name]
    sys.modules.pop('thread', None)
    super(ModuleOverrideImportHookTest, self).tearDown() 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def get_importer(path_item):
    """Retrieve a PEP 302 importer for the given path item

    The returned importer is cached in sys.path_importer_cache
    if it was newly created by a path hook.

    If there is no importer, a wrapper around the basic import
    machinery is returned. This wrapper is never inserted into
    the importer cache (None is inserted instead).

    The cache (or part of it) can be cleared manually if a
    rescan of sys.path_hooks is necessary.
    """
    try:
        importer = sys.path_importer_cache[path_item]
    except KeyError:
        for path_hook in sys.path_hooks:
            try:
                importer = path_hook(path_item)
                break
            except ImportError:
                pass
        else:
            importer = None
        sys.path_importer_cache.setdefault(path_item, importer)

    if importer is None:
        try:
            importer = ImpImporter(path_item)
        except ImportError:
            importer = None
    return importer 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import path_hooks [as 别名]
def _get_importer(path_name):
    """Python version of PyImport_GetImporter C API function"""
    cache = sys.path_importer_cache
    try:
        importer = cache[path_name]
    except KeyError:
        # Not yet cached. Flag as using the
        # standard machinery until we finish
        # checking the hooks
        cache[path_name] = None
        for hook in sys.path_hooks:
            try:
                importer = hook(path_name)
                break
            except ImportError:
                pass
        else:
            # The following check looks a bit odd. The trick is that
            # NullImporter throws ImportError if the supplied path is a
            # *valid* directory entry (and hence able to be handled
            # by the standard import machinery)
            try:
                importer = imp.NullImporter(path_name)
            except ImportError:
                return None
        cache[path_name] = importer
    return importer