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python3.2  3.2.2
Public Member Functions | Static Public Attributes
importlib.test.builtin.test_loader.LoaderTests Class Reference
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List of all members.

Public Member Functions

def verify
def test_module
def test_package
def test_lacking_parent
def test_state_after_failure
def test_module_reuse
def test_unloadable
def test_already_imported
def __new__
def register
def __instancecheck__
def __subclasscheck__

Static Public Attributes

dictionary verification
tuple load_module

Detailed Description

Test load_module() for built-in modules.

Definition at line 12 of file test_loader.py.


Member Function Documentation

def abc.ABCMeta.__instancecheck__ (   cls,
  instance 
) [inherited]
Override for isinstance(instance, cls).

Definition at line 158 of file abc.py.

00158 
00159     def __instancecheck__(cls, instance):
00160         """Override for isinstance(instance, cls)."""
00161         # Inline the cache checking
00162         subclass = instance.__class__
00163         if subclass in cls._abc_cache:
00164             return True
00165         subtype = type(instance)
00166         if subtype is subclass:
00167             if (cls._abc_negative_cache_version ==
00168                 ABCMeta._abc_invalidation_counter and
00169                 subclass in cls._abc_negative_cache):
00170                 return False
00171             # Fall back to the subclass check.
00172             return cls.__subclasscheck__(subclass)
00173         return any(cls.__subclasscheck__(c) for c in {subclass, subtype})

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def abc.ABCMeta.__new__ (   mcls,
  name,
  bases,
  namespace 
) [inherited]

Definition at line 116 of file abc.py.

00116 
00117     def __new__(mcls, name, bases, namespace):
00118         cls = super().__new__(mcls, name, bases, namespace)
00119         # Compute set of abstract method names
00120         abstracts = {name
00121                      for name, value in namespace.items()
00122                      if getattr(value, "__isabstractmethod__", False)}
00123         for base in bases:
00124             for name in getattr(base, "__abstractmethods__", set()):
00125                 value = getattr(cls, name, None)
00126                 if getattr(value, "__isabstractmethod__", False):
00127                     abstracts.add(name)
00128         cls.__abstractmethods__ = frozenset(abstracts)
00129         # Set up inheritance registry
00130         cls._abc_registry = WeakSet()
00131         cls._abc_cache = WeakSet()
00132         cls._abc_negative_cache = WeakSet()
00133         cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter
00134         return cls

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def abc.ABCMeta.__subclasscheck__ (   cls,
  subclass 
) [inherited]
Override for issubclass(subclass, cls).

Definition at line 174 of file abc.py.

00174 
00175     def __subclasscheck__(cls, subclass):
00176         """Override for issubclass(subclass, cls)."""
00177         # Check cache
00178         if subclass in cls._abc_cache:
00179             return True
00180         # Check negative cache; may have to invalidate
00181         if cls._abc_negative_cache_version < ABCMeta._abc_invalidation_counter:
00182             # Invalidate the negative cache
00183             cls._abc_negative_cache = WeakSet()
00184             cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter
00185         elif subclass in cls._abc_negative_cache:
00186             return False
00187         # Check the subclass hook
00188         ok = cls.__subclasshook__(subclass)
00189         if ok is not NotImplemented:
00190             assert isinstance(ok, bool)
00191             if ok:
00192                 cls._abc_cache.add(subclass)
00193             else:
00194                 cls._abc_negative_cache.add(subclass)
00195             return ok
00196         # Check if it's a direct subclass
00197         if cls in getattr(subclass, '__mro__', ()):
00198             cls._abc_cache.add(subclass)
00199             return True
00200         # Check if it's a subclass of a registered class (recursive)
00201         for rcls in cls._abc_registry:
00202             if issubclass(subclass, rcls):
00203                 cls._abc_cache.add(subclass)
00204                 return True
00205         # Check if it's a subclass of a subclass (recursive)
00206         for scls in cls.__subclasses__():
00207             if issubclass(subclass, scls):
00208                 cls._abc_cache.add(subclass)
00209                 return True
00210         # No dice; update negative cache
00211         cls._abc_negative_cache.add(subclass)
00212         return False

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def abc.ABCMeta.register (   cls,
  subclass 
) [inherited]
Register a virtual subclass of an ABC.

Definition at line 135 of file abc.py.

00135 
00136     def register(cls, subclass):
00137         """Register a virtual subclass of an ABC."""
00138         if not isinstance(subclass, type):
00139             raise TypeError("Can only register classes")
00140         if issubclass(subclass, cls):
00141             return  # Already a subclass
00142         # Subtle: test for cycles *after* testing for "already a subclass";
00143         # this means we allow X.register(X) and interpret it as a no-op.
00144         if issubclass(cls, subclass):
00145             # This would create a cycle, which is bad for the algorithm below
00146             raise RuntimeError("Refusing to create an inheritance cycle")
00147         cls._abc_registry.add(subclass)
00148         ABCMeta._abc_invalidation_counter += 1  # Invalidate negative cache

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Definition at line 60 of file test_loader.py.

00060 
00061     def test_already_imported(self):
00062         # Using the name of a module already imported but not a built-in should
00063         # still fail.
00064         assert hasattr(importlib, '__file__')  # Not a built-in.
00065         with self.assertRaises(ImportError):
00066             self.load_module('importlib')
00067 

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A loader should not be dependent on it's parent package being
imported.

Reimplemented from importlib.test.abc.LoaderTests.

Definition at line 39 of file test_loader.py.

00039 
00040     def test_lacking_parent(self):
00041         # Built-in modules cannot be a package.
00042         pass

A module should load without issue.

After the loader returns the module should be in sys.modules.

Attributes to verify:

    * __file__
    * __loader__
    * __name__
    * No __path__

Reimplemented from importlib.test.abc.LoaderTests.

Definition at line 29 of file test_loader.py.

00029 
00030     def test_module(self):
00031         # Common case.
00032         with util.uncache(builtin_util.NAME):
00033             module = self.load_module(builtin_util.NAME)
00034             self.verify(module)

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If a module is already in sys.modules, it should be reused.

Reimplemented from importlib.test.abc.LoaderTests.

Definition at line 47 of file test_loader.py.

00047 
00048     def test_module_reuse(self):
00049         # Test that the same module is used in a reload.
00050         with util.uncache(builtin_util.NAME):
00051             module1 = self.load_module(builtin_util.NAME)
00052             module2 = self.load_module(builtin_util.NAME)
00053             self.assertTrue(module1 is module2)

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Loading a package should work.

After the loader returns the module should be in sys.modules.

Attributes to verify:

    * __name__
    * __file__
    * __package__
    * __path__
    * __loader__

Reimplemented from importlib.test.abc.LoaderTests.

Definition at line 35 of file test_loader.py.

00035 
00036     def test_package(self):
00037         # Built-in modules cannot be a package.
00038         pass

If a module is already in sys.modules and a reload fails
(e.g. a SyntaxError), the module should be in the state it was before
the reload began.

Reimplemented from importlib.test.abc.LoaderTests.

Definition at line 43 of file test_loader.py.

00043 
00044     def test_state_after_failure(self):
00045         # Not way to force an imoprt failure.
00046         pass

Test ImportError is raised when the loader is asked to load a module
it can't.

Reimplemented from importlib.test.abc.LoaderTests.

Definition at line 54 of file test_loader.py.

00054 
00055     def test_unloadable(self):
00056         name = 'dssdsdfff'
00057         assert name not in sys.builtin_module_names
00058         with self.assertRaises(ImportError):
00059             self.load_module(name)

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Verify that the module matches against what it should have.

Definition at line 19 of file test_loader.py.

00019 
00020     def verify(self, module):
00021         """Verify that the module matches against what it should have."""
00022         self.assertTrue(isinstance(module, types.ModuleType))
00023         for attr, value in self.verification.items():
00024             self.assertEqual(getattr(module, attr), value)
00025         self.assertTrue(module.__name__ in sys.modules)

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Member Data Documentation

Initial value:
staticmethod(lambda name:
                                machinery.BuiltinImporter.load_module(name))

Definition at line 26 of file test_loader.py.

Initial value:
{'__name__': 'errno', '__package__': '',
                    '__loader__': machinery.BuiltinImporter}

Definition at line 16 of file test_loader.py.


The documentation for this class was generated from the following file: