Lib/types.py

"""
Define names for built-in types that aren't directly accessible as a builtin.
"""
import sys

# Iterators in Python aren't a matter of type but of protocol.  A large
# and changing number of builtin types implement *some* flavor of
# iterator.  Don't check the type!  Use hasattr to check for both
# "__iter__" and "__next__" attributes instead.

def _f(): pass
FunctionType = type(_f)
LambdaType = type(lambda: None)         # Same as FunctionType
CodeType = type(_f.__code__)

def _g():
    yield 1
GeneratorType = type(_g())

class _C:
    def _m(self): pass
MethodType = type(_C()._m)

BuiltinFunctionType = type(len)
BuiltinMethodType = type([].append)     # Same as BuiltinFunctionType

ModuleType = type(sys)

try:
    raise TypeError
except TypeError:
    tb = sys.exc_info()[2]
    TracebackType = type(tb)
    FrameType = type(tb.tb_frame)
    tb = None; del tb

# Extension types defined in a C helper module.  XXX There may be no
# equivalent in implementations other than CPython, so it seems better to
# leave them undefined then to set them to e.g. None.
try:
    import _types
except ImportError:
    pass
else:
    GetSetDescriptorType = type(_types.Helper.getter)
    MemberDescriptorType = type(_types.Helper.member)
    del _types

del sys, _f, _g, _C,                              # Not for export