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别再死记硬背了!这10个Python基础语法,看一眼就刻进DNA里

  • 2026-02-02 11:23:50
别再死记硬背了!这10个Python基础语法,看一眼就刻进DNA里

你不是学不会,是方法错了

很多人一上来就啃《Python核心编程》,结果三天后连print都打不利索。别硬扛了
Python的入门门槛其实很低——关键不是背,而是理解逻辑
我带过上千名学员,90%卡在“以为必须全记住”这个误区上。

变量命名:别用拼音,也别装黑客

变量名 = 你的代码名片
见过a1, b2, user_data_temp_final_v3吗?🤯
规则就一条:见名知意
比如user_agenianling专业100倍,还省下解释成本。

缩进不是装饰,是Python的命门

其他语言用大括号{},Python靠缩进说话
少一个空格?直接报错给你看。
记住:4个空格是亲爹,Tab是后妈(别混用!)。
这设计看似反人类,实则逼你写出整齐代码——真香!

字符串拼接:+号早过时了

还在写"Hello " + name + "!"性能杀手
f-string才是王道f"Hello {name}!"
不仅快30%(实测数据),还清爽得像刚洗过的衬衫 👔。

列表推导式:一行干翻for循环

想生成[1,4,9,16]?菜鸟写5行,老手写1行:
squares = [x**2 for x in range(1,5)]
省代码=省bug=省头发
但别滥用!嵌套三层以上?赶紧住手!

if-else的骚操作:三元表达式

传统写法占5行?试试这个:
status = "成年" if age >= 18 else "未成年"
短平快,还带点极客范儿
不过复杂逻辑别硬塞,否则同事会追杀你 😅。

函数默认参数:小心“共享陷阱”

别这么写def add_item(item, target_list=[])
空列表[]是可变对象,会被所有调用共享
正确姿势:def add_item(item, target_list=None)
然后在函数内初始化。血泪教训啊朋友们!

import不是万能胶,别乱贴

from os import * 看似省事,实则埋雷
命名冲突、代码难读、调试崩溃…
明确导入才专业import pandas as pd
既清晰又避免污染命名空间。

异常处理:别让程序裸奔

裸奔代码result = 10 / user_input
专业代码

try:
    result = 10 / user_input
except ZeroDivisionError:
    print("除数不能为零!")

用户骂你,总比程序崩掉强

调试神器:print不是终点

新手靠print,老手靠logging模块
日志分级(debug/info/warning)+ 文件输出
排查问题效率提升200%。
记住:print是拐杖,logging才是跑鞋 🏃。

最后说句掏心窝的

这些语法点,我当年踩坑全靠头铁
现在整理出来,就是不想你重蹈覆辙。
Python的优雅,在于用简单逻辑解决复杂问题——
不是背语法,是练思维

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  1. CONNECT:[ UseTime:0.001361s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002144s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000789s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000703s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001807s ]
  6. SELECT * FROM `set` [ RunTime:0.000602s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001956s ]
  8. SELECT * FROM `article` WHERE `id` = 464085 LIMIT 1 [ RunTime:0.001160s ]
  9. UPDATE `article` SET `lasttime` = 1770531149 WHERE `id` = 464085 [ RunTime:0.032642s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000912s ]
  11. SELECT * FROM `article` WHERE `id` < 464085 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001385s ]
  12. SELECT * FROM `article` WHERE `id` > 464085 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001105s ]
  13. SELECT * FROM `article` WHERE `id` < 464085 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002180s ]
  14. SELECT * FROM `article` WHERE `id` < 464085 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002734s ]
  15. SELECT * FROM `article` WHERE `id` < 464085 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005111s ]
0.208784s