Lib/types.py

   1 """Define names for all type symbols known in the standard interpreter.
   2
   3 Types that are part of optional modules (e.g. array) are not listed.
   4 """
   5 import sys
   6
   7 # Iterators in Python aren't a matter of type but of protocol.  A large
   8 # and changing number of builtin types implement *some* flavor of
   9 # iterator.  Don't check the type!  Use hasattr to check for both
  10 # "__iter__" and "next" attributes instead.
  11
  12 NoneType = type(None)
  13 TypeType = type
  14 ObjectType = object
  15
  16 IntType = int
  17 LongType = long
  18 FloatType = float
  19 BooleanType = bool
  20 try:
  21     ComplexType = complex
  22 except NameError:
  23     pass
  24
  25 StringType = str
  26
  27 # StringTypes is already outdated.  Instead of writing "type(x) in
  28 # types.StringTypes", you should use "isinstance(x, basestring)".  But
  29 # we keep around for compatibility with Python 2.2.
  30 try:
  31     UnicodeType = unicode
  32     StringTypes = (StringType, UnicodeType)
  33 except NameError:
  34     StringTypes = (StringType,)
  35
  36 BufferType = buffer
  37
  38 TupleType = tuple
  39 ListType = list
  40 DictType = DictionaryType = dict
  41
  42 def _f(): pass
  43 FunctionType = type(_f)
  44 LambdaType = type(lambda: None)         # Same as FunctionType
  45 CodeType = type(_f.func_code)
  46
  47 def _g():
  48     yield 1
  49 GeneratorType = type(_g())
  50
  51 class _C:
  52     def _m(self): pass
  53 ClassType = type(_C)
  54 UnboundMethodType = type(_C._m)         # Same as MethodType
  55 _x = _C()
  56 InstanceType = type(_x)
  57 MethodType = type(_x._m)
  58
  59 BuiltinFunctionType = type(len)
  60 BuiltinMethodType = type([].append)     # Same as BuiltinFunctionType
  61
  62 ModuleType = type(sys)
  63 FileType = file
  64 XRangeType = xrange
  65
  66 try:
  67     raise TypeError
  68 except TypeError:
  69     tb = sys.exc_info()[2]
  70     TracebackType = type(tb)
  71     FrameType = type(tb.tb_frame)
  72     del tb
  73
  74 SliceType = slice
  75 EllipsisType = type(Ellipsis)
  76
  77 DictProxyType = type(TypeType.__dict__)
  78 NotImplementedType = type(NotImplemented)
  79
  80 # For Jython, the following two types are identical
  81 GetSetDescriptorType = type(FunctionType.func_code)
  82 MemberDescriptorType = type(FunctionType.func_globals)
  83
  84 del sys, _f, _g, _C, _x                           # Not for export