型判別とか その２

python

昨日の日記で書いて気になりだしたので少し詳しく調べてみた。

強いて分類すると
リテラルっぽいのは

  • NoneType(None)
  • BooleanType(True, False)
  • IntType, LongType, FloatTypeなどの数字
  • StringType, UnicodeTypeなどの文字列

意外？にも全て__class__アトリビュートがあったりする。
int(), str()あたりも知っていると便利。

コンテナ類は

  • TupleType, ListType, DictionaryTypeなど

クラス類は

このあたりの判別にis演算子とかisinstance()を使う

関数類に

  • FunctionType, BuiltinFunctionType, BuiltinMethodTypeなど

そのほかに

  • TypeType
  • ModuleType

なんかがあった。
すっきりしていないということが納得できたｗ

実験に使ったスクリプト

class LegacyClass:
  def __init__(self):
    self.property=1

class NewStyleClass:
  def __init__(self):
    self.property=1

def generator():
  count=0
  while True:
    yield count
    count+=1

def analyse(obj):
  print obj
  obj_type=type(obj)
  print obj_type
  try:
    print obj.__class__
  except AttributeError, e:
    print e
  # types
  if obj_type is types.NoneType:
    print "is NoneType"
  if obj_type is types.TypeType:
    print "is TypeType"
  if obj_type is types.BooleanType:
    print "is BooleanType"
  if obj_type is types.IntType:
    print "is IntType"
  if obj_type is types.LongType:
    print "is LongType"
  if obj_type is types.FloatType:
    print "is FloatType"
  if obj_type is types.ComplexType:
    print "is ComplexType"
  if obj_type is types.StringType:
    print "is StringType"
  if obj_type is types.UnicodeType:
    print "is UnicodeType"
  if obj_type is types.TupleType:
    print "is TupleType"
  if obj_type is types.ListType:
    print "is ListType"
  if obj_type is types.DictType:
    print "is DictType"
  if obj_type is types.DictionaryType:
    print "is DictionaryType"
  if obj_type is types.FunctionType:
    print "is FunctionType"
  if obj_type is types.LambdaType:
    print "is LambdaType"
  if obj_type is types.GeneratorType:
    print "is GeneratorType"
  if obj_type is types.CodeType:
    print "is CodeType"
  if obj_type is types.ClassType:
    print "is ClassType"
  if obj_type is types.InstanceType:
    print "is InstanceType"
  if obj_type is types.MethodType:
    print "is MethodType"
  if obj_type is types.UnboundMethodType:
    print "is UnboundMethodType"
  if obj_type is types.BuiltinFunctionType:
    print "is BuiltinFunctionType"
  if obj_type is types.BuiltinMethodType:
    print "is BuiltinMethodType"
  if obj_type is types.ModuleType:
    print "is ModuleType"
  if obj_type is types.FileType:
    print "is FileType"
  if obj_type is types.XRangeType:
    print "is XRangeType"
  if obj_type is types.SliceType:
    print "is SliceType"
  if obj_type is types.EllipsisType:
    print "is EllipsisType"
  if obj_type is types.TracebackType:
    print "is TracebackType"
  if obj_type is types.FrameType:
    print "is FrameType"
  if obj_type is types.BufferType:
    print "is BufferType"
  if obj_type is types.DictProxyType:
    print "is DictProxyType"
  if obj_type is types.NotImplementedType:
    print "is NotImplementedType"
  if obj_type is types.GetSetDescriptorType:
    print "is GetSetDescriptorType"
  if obj_type is types.MemberDescriptorType:
    print "is MemberDescriptorType"
  if obj_type is types.StringTypes:
    print "is StringTypes"
  # inspect
  if inspect.ismodule(obj):
    print "is module"
  if inspect.isclass(obj):
    print "is class"
  if inspect.ismethod(obj):
    print "is method"
  if inspect.isfunction(obj):
    print "is function"
  if inspect.istraceback(obj):
    print "is traceback"
  if inspect.isframe(obj):
    print "is frame"
  if inspect.iscode(obj):
    print "is code"
  if inspect.isbuiltin(obj):
    print "is builtin"
  if inspect.isroutine(obj):
    print "is routine"
  if inspect.ismethoddescriptor(obj):
    print "is method descriptor"
  if inspect.isdatadescriptor(obj):
    print "is data descriptor"
  if inspect.isgetsetdescriptor(obj):
    print "is get set descriptor"
  if inspect.ismemberdescriptor(obj):
    print "is member descriptor"
  print

if __name__=="__main__":
  import types
  import inspect
  import sys

  analyse(1)
  analyse(.1)
  analyse(None)
  analyse(True)
  analyse(False)
  analyse(["list"])
  analyse(("tu", "ple"))
  analyse({"dict":"ionary"})
  analyse("string")
  analyse(u"unicode")
  analyse(analyse)
  analyse(xrange(2))
  analyse(generator)
  analyse(reversed([]))
  analyse(lambda x:x+x)
  analyse(dir)
  analyse(LegacyClass)
  analyse(LegacyClass())
  analyse(NewStyleClass)
  analyse(NewStyleClass())
  analyse(types)
  analyse(sys)
  analyse(int)
  analyse(str)
  analyse(list)
  analyse(dict)