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