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  27 # StringTypes is already outdated.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 try:
  46     CodeType = type(_f.func_code)
  47 except RuntimeError:
  48     # Execution in restricted environment
  49     pass
  50
  51 def g():
  52     yield 1
  53 GeneratorType = type(g())
  54 del g
  55
  56 class _C:
  57     def _m(self): pass
  58 ClassType = type(_C)
  59 UnboundMethodType = type(_C._m)         # Same as MethodType
  60 _x = _C()
  61 InstanceType = type(_x)
  62 MethodType = type(_x._m)
  63
  64 BuiltinFunctionType = type(len)
  65 BuiltinMethodType = type([].append)     # Same as BuiltinFunctionType
  66
  67 ModuleType = type(sys)
  68 FileType = file
  69 XRangeType = xrange
  70
  71 try:
  72     raise TypeError
  73 except TypeError:
  74     try:
  75         tb = sys.exc_info()[2]
  76         TracebackType = type(tb)
  77         FrameType = type(tb.tb_frame)
  78     except AttributeError:
  79         # In the restricted environment, exc_info returns (None, None,
  80         # None) Then, tb.tb_frame gives an attribute error
  81         pass
  82     tb = None; del tb
  83
  84 SliceType = slice
  85 EllipsisType = type(Ellipsis)
  86
  87 DictProxyType = type(TypeType.__dict__)
  88 NotImplementedType = type(NotImplemented)
  89
  90 del sys, _f, _C, _x                  # Not for export