Python 笔记1 input 与raw_input

尝试写一个猜字游戏时，使用了raw_input()作为输入。

代码如下。

think = 53guess = raw_input("Guess what I think\n")

while True:
    if guess > think:
        print "It‘s too big."
        guess = raw_input("Guess one more time.\n")
    if guess < think:
        print "It‘s too small."
        guess = raw_input("Guess one more time.\n")
    if guess == think:
        print "Greet, you get it."
        break

运行结果：输入数字无论是否大于53，打印结果皆为 It‘s too big.

猜测可能 raw_input() 返回字符非 int

尝试使用 int() 转化为整型，修改代码如下：

think = 53
guess = int(raw_input("Guess what I think\n"))

while True:
    if guess > think:
        print "It‘s too big."
        guess = int(raw_input("Guess one more time.\n"))
    if guess < think:
        print "It‘s too small."
        guess = int(raw_input("Guess one more time.\n"))
    if guess == think:
        print "Greet, you get it."
        break

修改后可正常运行。

网上查阅：

“

Python input和raw_input的区别

使用input和raw_input都可以读取控制台的输入，但是input和raw_input在处理数字时是有区别的
纯数字输入

当输入为纯数字时

input返回的是数值类型，如int,float
    raw_inpout返回的是字符串类型，string类型

"

在输入内容为int或者float时可直接使用 input() 来接受输入，未必使用 raw_input()。