Python raw_input 函数 - Python零基础入门教程

川长思鸟来 2022-08-30 11:39 76阅读 0赞

*  一.前言
 *  二.Python input 和 raw\_input 区别
    
     *  1.当输入为纯数字时
     *  2.当输入字符串为表达式
 *  三.Python input 函数实现原理
 *  四.猜你喜欢

> 基础 Python 学习路线推荐 : [Python 学习目录][Python] >> [Python 基础入门][Python 1]

## 一.前言 ##

Python 2.x 版本中才有内置函数 [raw\_input][raw_input] 和 [input][] 两个函数；

**Python 3.x 版本中并没有内置函数 raw\_input，如果在 Python 3.x 版本中使用内置函数 raw\_input，会提示：NameError: name ‘raw\_input’ is not defined**

## 二.Python input 和 raw\_input 区别 ##

### 1.当输入为纯数字时 ###

*  \*\* input 返回的是数值类型，如 [int , float][int _ float]\*\*
 *  \*\* raw\_inpout 返回的是字符串类型，[string 类型][string]\*\*

### 2.当输入字符串为表达式 ###

**[Python][Python 2] input 会计算在字符串中的数字表达式，而 raw\_input 不会。**

> 如输入 “57 + 3” : input 会得到整数 60 ；raw\_input 会得到字符串 ”57 + 3”；

## 三.Python input 函数实现原理 ##

看 Python input 文档，可以看到 input 其实是通过 raw\_input 来实现的，原理很简单，就下面一行代码：

# !usr/bin/env python
    # -*- coding:utf-8 _*-
    """
    @Author:猿说编程
    @Blog(个人博客地址): www.codersrc.com
    @File:Python raw_input 函数.py
    @Time:2021/05/04 07:37
    @Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！
    
    """
    
    def input(prompt):
    
        return (eval(raw_input(prompt)))

## 四.**猜你喜欢** ##

1.  [Python for 循环][Python for]
2.  [Python 字符串][string]
3.  [Python 列表 list][Python _ list]
4.  [Python 元组 tuple][Python _ tuple]
5.  [Python 字典 dict][Python _ dict]
6.  [Python 条件推导式][Python 3]
7.  [Python 列表推导式][Python 4]
8.  [Python 字典推导式][Python 5]
9.  [Python 函数声明和调用][Python 6]
10. [Python 不定长参数 \*argc/\*\*kargcs][Python _ _argc_kargcs]
11. [Python 匿名函数 lambda][Python _ lambda]
12. [Python return 逻辑判断表达式][Python return]
13. [Python 字符串/列表/元组/字典之间的相互转换][Python 7]
14. [Python 局部变量和全局变量][Python 8]
15. [Python type 函数和 isinstance 函数区别][Python type _ isinstance]
16. [Python is 和 == 区别][Python is _ _]
17. [Python 可变数据类型和不可变数据类型][Python 9]
18. [Python 浅拷贝和深拷贝][Python 10]

未经允许不得转载：[猿说编程][Link 1] » [Python raw\_input 函数][raw_input]

[Python]: https://www.codersrc.com/python
[Python 1]: https://www.codersrc.com/pythonsimple
[raw_input]: https://www.codersrc.com/archives/6303.html
[input]: https://www.codersrc.com/archives/5761.html
[int _ float]: https://www.codersrc.com/archives/4770.html
[string]: https://www.codersrc.com/archives/4996.html
[Python 2]: https://www.codersrc.com/
[Python for]: https://www.codersrc.com/archives/4953.html
[Python _ list]: https://www.codersrc.com/archives/5061.html
[Python _ tuple]: https://www.codersrc.com/archives/5088.html
[Python _ dict]: https://www.codersrc.com/archives/5114.html
[Python 3]: https://www.codersrc.com/archives/5346.html
[Python 4]: https://www.codersrc.com/archives/5359.html
[Python 5]: https://www.codersrc.com/archives/5377.html
[Python 6]: https://www.codersrc.com/archives/5405.html
[Python _ _argc_kargcs]: https://www.codersrc.com/archives/5443.html
[Python _ lambda]: https://www.codersrc.com/archives/5756.html
[Python return]: https://www.codersrc.com/archives/5759.html
[Python 7]: https://www.codersrc.com/archives/5137.html
[Python 8]: https://www.codersrc.com/archives/5156.html
[Python type _ isinstance]: https://www.codersrc.com/archives/5214.html
[Python is _ _]: https://www.codersrc.com/archives/5288.html
[Python 9]: https://www.codersrc.com/archives/5271.html
[Python 10]: https://www.codersrc.com/archives/5492.html
[Link 1]: https://www.codersrc.com