Python学习--判断变量的数据类型

 import types

 aaa = 0
 print type(aaa)
 if type(aaa) is types.IntType:
     print "the type of aaa is int"
 if isinstance(aaa,int):
     print "the type of aaa is int"

 bbb = 'hello'
 print type(bbb)
 if type(bbb) is types.StringType:
     print "the type of bbb is string"
 if isinstance(bbb,str):
     print "the type of bbb is string"

 #if the type is NoneType,the isinstance does not work
 #we should judge the NoneType like below
 #if row is None
 #if type(row) is types.NoneType

 #In my opinion,use the types to judge the type of a param is convinient<span style="font-family:Arial;background-color: rgb(255, 255, 255);">, use the isinstance to judge whether a instance is a type of a class or not</span>