python判斷變量是否爲數字、字符串、列表、字典等

copy from : https://www.jianshu.com/p/09d94bca8e54

在實際寫程序中，經常要對變量類型進行判斷，除了用type(變量)這種方法外，還可以用isinstance方法判斷：

a = [1,2]
if 'list' in str(type(a)):
    print('1')
else:
    print('2')

a = 1
b = [1,2,3,4]
c = (1,2,3,4)
d = {‘a‘:1,‘b‘:2,‘c‘:3}
e = "abc"
if isinstance(a,int):
    print "a is int"
else:
    print "a is not int"
if isinstance(b,list):
    print "b is list"
else:
    print "b is not list"
if isinstance(c,tuple):
    print "c is tuple"
else:
    print "c is not tuple"
if isinstance(d,dict):
    print "d is dict"
else:
    print "d is not dict"
if isinstance(e,str):
    print "d is str"
else:
    print "d is not str"

作者：阿拉雞
鏈接：https://www.jianshu.com/p/09d94bca8e54
來源：簡書
著作權歸作者所有。商業轉載請聯繫作者獲得授權，非商業轉載請註明出處。

在實際寫程序中，經常要對變量類型進行判斷，除了用type(變量)這種方法外，還可以用isinstance方法判斷：

a = [1,2]
if 'list' in str(type(a)):
    print('1')
else:
    print('2')

a = 1
b = [1,2,3,4]
c = (1,2,3,4)
d = {‘a‘:1,‘b‘:2,‘c‘:3}
e = "abc"
if isinstance(a,int):
    print "a is int"
else:
    print "a is not int"
if isinstance(b,list):
    print "b is list"
else:
    print "b is not list"
if isinstance(c,tuple):
    print "c is tuple"
else:
    print "c is not tuple"
if isinstance(d,dict):
    print "d is dict"
else:
    print "d is not dict"
if isinstance(e,str):
    print "d is str"
else:
    print "d is not str"

作者：阿拉雞
鏈接：https://www.jianshu.com/p/09d94bca8e54
來源：簡書
著作權歸作者所有。商業轉載請聯繫作者獲得授權，非商業轉載請註明出處。