python中input()和raw_input()的區別

使用input和raw_input都可以讀取控制台的輸入，input()只能接受int,float或由它們組成的運算式：

Python 2.7.5 (default, Mar 19 2014, 07:24:16)[GCC 4.5.4] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> input("input something: ")input something: 123123>>> input("input something: ")input something: abcTraceback (most recent call last):  File "<stdin>", line 1, in <module>  File "<string>", line 1, in <module>NameError: name 'abc' is not defined>>>

input和raw_input在處理數字時是有區別的：

1.輸入為純數字時
input返回的是數實值型別，如int,float
raw_inpout返回的是字串類型，string類型

print "how old are you?"age1 = input()print "%r" % age1printage2 = raw_input()print "%r" % age2 

返回結果：

how old are you?222222'22' //raw_input()把輸入整形當做字串處理

2.輸入字串為運算式
input會計算在字串中的數字運算式，而raw_input不會。

sum = input()print "%r" % sumprintsum = raw_input()print "%r" % sum 

結果：

1+231+2'1+2'