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Python极简入门:你的第一个程序Hello World

  • 2026-03-20 13:40:02
Python极简入门:你的第一个程序Hello World

对于刚接触Python的新手来说,不用纠结复杂配置,既然Python环境已经全部配置到位,那编写第一个Hello World程序就变得格外简单,全程只需几步,一行核心代码就能跑出结果,轻松开启编程第一步。

一、极简前提:无需再配环境,直接上手

本篇教程默认你的电脑已经完成Python环境安装、系统变量配置,无需额外检查环境、下载安装包,跳过所有前置准备环节,直接进入代码编写与运行阶段,主打一个高效入门。

二、两种极简方式运行Hello World

Python运行代码有两种超简单的方式,按需选择即可,全程无复杂操作,新手闭眼就能操作。

方式1:交互模式(速测即用,无需建文件)

适合临时试代码,不用保存文件,即输即出,步骤超精简:

  1. 打开电脑终端:Windows按Win+R输cmd打开命令提示符;

  2. 输入python(Windows),回车进入Python交互界面,看到>>>提示符就可以输代码;

  3. 输入核心代码:print("Hello World"),按下回车,控制台立刻输出Hello World,程序运行完成。

小贴士:这种模式代码不会保存,适合快速测试,用完直接关闭终端即可。

Image

方式2:文件模式(代码留存,常用推荐)

这是日常编程最实用的方式,代码可永久保存、反复修改,三步就能搞定:

  1. 新建Python文件:在桌面新建文本文档,  写入
# 首个Python程序
print("Hello World")
  1. 重命名为hello.py,切记后缀必须是.py,文件名用英文,别加中文或特殊符号,避免报错;

  2. 运行文件出结果:cmd打开终端,输入python C:\Users\admin\Desktop\hello.py,回车就能看到Hello World的输出结果。

Image

三、核心代码一句话讲透

全程只有一行关键代码,新手不用深究复杂原理,记牢两点就够:

  • **print()**:Python自带的输出函数,括号里写啥,控制台就会显示啥,是最基础的打印指令;

  • 引号规则:文字内容必须用英文双引号""或单引号''包裹,且要成对出现,不能用中文标点,否则会报错。

四、新手极简避坑指南

环境已配置好,只需避开这几个小细节,就能零报错运行:

别用中文标点:括号、引号必须是英文状态下输入,中文标点会直接触发语法错误。

文件名别出错:后缀必须是.py,不能是hello.py.txt,系统会识别成文本文档,无法运行。

终端路径要对:运行文件时,终端一定要切换到hello.py所在的文件夹,不然会提示找不到文件。

写在最后

成功运行Hello World,就代表你正式踏入Python大门啦!不用觉得编程晦涩难懂,从这一行简单代码开始,慢慢熟悉语法、多动手实操,后续就能逐步解锁更多Python实用技能,轻松进阶。

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  1. CONNECT:[ UseTime:0.000531s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000813s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000370s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000310s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000498s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
  8. SELECT * FROM `article` WHERE `id` = 480591 LIMIT 1 [ RunTime:0.000376s ]
  9. UPDATE `article` SET `lasttime` = 1774582799 WHERE `id` = 480591 [ RunTime:0.008146s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000267s ]
  11. SELECT * FROM `article` WHERE `id` < 480591 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000436s ]
  12. SELECT * FROM `article` WHERE `id` > 480591 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002258s ]
  13. SELECT * FROM `article` WHERE `id` < 480591 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000900s ]
  14. SELECT * FROM `article` WHERE `id` < 480591 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002069s ]
  15. SELECT * FROM `article` WHERE `id` < 480591 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001069s ]
0.088552s