Python: check argument type

• for objects:

  def f(arg):
      if isinstance(arg, ClassA):
          print('A')
      elif isintance(arg, ClassB):
          print('B')
      elif issubclass(arg, ClassC):
          print('subclass of C')
      else:
          print("D")
  

• for built-in types:

  def f(arg):
      if type(arg) is str:
          print "str"
      elif type(arg) is int:
          print "int"
      elif type(arg) is dict:
          print "dict"
      else:
          print "unsupported"