cpython/Lib/types.py

100 lines
2.5 KiB
Python

"""Define names for all type symbols known in the standard interpreter.
Types that are part of optional modules (e.g. array) are not listed.
"""
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.
NoneType = type(None)
TypeType = type
ObjectType = object
IntType = int
LongType = int
FloatType = float
BooleanType = bool
try:
ComplexType = complex
except NameError:
pass
StringType = str
# StringTypes is already outdated. Instead of writing "type(x) in
# types.StringTypes", you should use "isinstance(x, basestring)". But
# we keep around for compatibility with Python 2.2.
try:
UnicodeType = unicode
StringTypes = (StringType, UnicodeType)
except NameError:
StringTypes = (StringType,)
BufferType = buffer
TupleType = tuple
ListType = list
DictType = DictionaryType = dict
def _f(): pass
FunctionType = type(_f)
LambdaType = type(lambda: None) # Same as FunctionType
try:
CodeType = type(_f.__code__)
except RuntimeError:
# Execution in restricted environment
pass
def _g():
yield 1
GeneratorType = type(_g())
class _C:
def _m(self): pass
ClassType = type(_C)
UnboundMethodType = type(_C._m) # Same as MethodType
MethodType = type(_C()._m)
BuiltinFunctionType = type(len)
BuiltinMethodType = type([].append) # Same as BuiltinFunctionType
ModuleType = type(sys)
FileType = file
XRangeType = xrange
try:
raise TypeError
except TypeError:
try:
tb = sys.exc_info()[2]
TracebackType = type(tb)
FrameType = type(tb.tb_frame)
except AttributeError:
# In the restricted environment, exc_info returns (None, None,
# None) Then, tb.tb_frame gives an attribute error
pass
tb = None; del tb
SliceType = slice
EllipsisType = type(Ellipsis)
DictProxyType = type(TypeType.__dict__)
NotImplementedType = type(NotImplemented)
# 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