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【Python小白速通】导入模块?说白了就是"给代码装插件、借工具"!

  • 2026-02-17 05:52:17
【Python小白速通】导入模块?说白了就是"给代码装插件、借工具"!

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【Python小白速通】导入模块?说白了就是"给代码装插件、借工具"!

咱之前写代码都是"徒手干活"——算个数自己写循环,排个序自己写逻辑,就像做饭全靠手掰蒜、刀切菜,累还慢!但Python早就给咱准备了一堆"现成工具":算数学题的、处理时间的、做数据分析的,这些工具打包在一起就是「模块」,导入模块就是"把这些工具借过来用",主打一个"不重复造轮子,直接抄近道"~

简单说,导入模块就像玩游戏时装"开挂插件":原本只能平A,装了"攻速插件"就能快刀斩乱麻;原本只能算加减,导入`math`模块就能直接算平方根、圆周率,不用自己吭哧吭哧写公式,效率直接拉满!

一、先唠透:啥是模块?为啥要导入?(纯人话版)

先掰碎了说,不整专业术语:

- 模块(Module):Python的"工具包",一个.py文件就是一个模块,里面装着现成的函数、变量、类,比如`math`模块装了所有数学工具,`time`模块装了所有时间处理工具;

- 导入模块:把"工具包"拿到自己的代码里,想用里面的工具直接喊名字就行,不用自己写;

- 核心好处:省时间、少出错、代码简洁——比如算圆的面积,导入`math`直接用`math.pi`(圆周率),比自己写`3.1415926`精准还省事!

举个栗子:你想做一杯"冰沙奶茶",不用自己买刨冰机、煮茶机(自己写代码),直接去奶茶店借现成的机器(导入模块),插上电就能用——刨冰机对应`math`里的`sqrt()`(平方根),煮茶机对应`time`里的`sleep()`(延时),借过来就干活,香得很!

二、实操!4种导入模块姿势,小白也能秒会

导入模块的核心是`import`关键字,咱从最简单的"全量导入"开始,代码都标了"人话注释",复制就能跑~

姿势1:最基础的全量导入(借整个工具包)

格式:`import 模块名`,把整个工具包借过来,用的时候加"模块名."调用工具,新手先拿捏这个!

python

#导入math模块(数学工具包)

import math

#用math里的工具:算16的平方根(不用自己写开方逻辑)

result1 = math.sqrt(16)

#用math里的常量:圆周率π

result2 = math.pi

print(f"✅ 16的平方根:{result1}")

print(f"✅ 圆周率π:{result2}")

👉 运行结果:

✅ 16的平方根:4.0

✅ 圆周率π:3.141592653589793

姿势2:给模块起"小名"(懒人版)

模块名太长?给它起个外号,比如`import pandas as pd`,像给"张翠花"起外号"翠花",喊着更顺口!

python

#导入time模块,起小名t

import time as t

#用小名调用工具:让代码暂停2秒(模拟等奶茶做好)

print("⏳ 开始做奶茶...")

t.sleep(2)  # 代替time.sleep(2)

print("✅ 奶茶做好啦!")

👉 运行结果:

⏳ 开始做奶茶...

(暂停2秒后)

✅ 奶茶做好啦!

姿势3:只导入需要的工具(精准借物)

不想借整个工具包?只挑需要的工具导入,比如只借`math`里的`pi`和`sqrt`,省内存还清爽!

python

#只导入math里的pi(圆周率)和sqrt(平方根)

from math import pi, sqrt

#直接用工具,不用加math.前缀

result = sqrt(25)

print(f"✅ 25的平方根:{result}")

print(f"✅ 用π算半径为2的圆面积:{pi * 2 * 2}")

👉 运行结果:

✅ 25的平方根:5.0

✅ 用π算半径为2的圆面积:12.566370614359172

姿势4:导入模块里的所有工具(慎用版)

格式:`from 模块名 import *`,把工具包里的所有工具都借过来,不用加前缀,但容易重名踩坑!

python

#导入math里的所有工具(*代表全部)

from math import *

#直接用任意工具:算正弦值(sin)、余弦值(cos)

result1 = sin(0)  # 0度的正弦值

result2 = cos(0)  # 0度的余弦值

print(f"✅ sin(0) = {result1}")

print(f"✅ cos(0) = {result2}")

👉 运行结果:

✅ sin(0) = 0.0

✅ cos(0) = 1.0

三、避坑小彩蛋:新手最容易踩的3个坑

1. 别拼错模块名:导入时模块名要小写!比如`import Math`会报错,Python认`math`不认`Math`,就像你喊"翠花"她答应,喊"翠华"她装听不见~

2. "小名"别乱起:起外号要统一,比如别一会`import numpy as np`,一会`import numpy as n`,自己都记混,像给同一个人起10个外号,最后自己都喊错~

3. 慎用import *:导入所有工具容易和自己写的变量/函数重名!比如你自己定义了`sqrt=10`,又`from math import *`,Python会懵:"到底用哪个sqrt?" 就像家里有两个叫"翠花"的,喊一声全答应,根本分不清~

四、常见模块大盘点(小白常用款)

| 模块名 | 核心功能(大白话)| 实用场景 |

|--------|------------------|----------|

| math | 数学计算(平方根、π、三角函数) | 算面积、算角度 |

| time | 时间处理(暂停、获取当前时间) | 做延时、记录耗时 |

| random | 生成随机数 | 抽奖、随机选奶茶口味 |

| os | 操作文件/文件夹 | 新建文件夹、读取文件 |

| sys | 操作Python解释器 | 获取系统信息、退出程序 |

总结

1. Python导入模块核心是`import`关键字,本质是"借现成工具包",避免重复写代码;

2. 新手优先掌握"全量导入(import 模块名)"和"起小名(as)",精准导入(from...import)更省内存;

3. 记住"模块名小写、慎用import *、小名要统一",能避开90%的导入坑。

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  1. CONNECT:[ UseTime:0.001282s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.005947s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000941s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000648s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001344s ]
  6. SELECT * FROM `set` [ RunTime:0.000594s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001495s ]
  8. SELECT * FROM `article` WHERE `id` = 475171 LIMIT 1 [ RunTime:0.002861s ]
  9. UPDATE `article` SET `lasttime` = 1771399015 WHERE `id` = 475171 [ RunTime:0.018263s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000819s ]
  11. SELECT * FROM `article` WHERE `id` < 475171 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001172s ]
  12. SELECT * FROM `article` WHERE `id` > 475171 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002459s ]
  13. SELECT * FROM `article` WHERE `id` < 475171 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002745s ]
  14. SELECT * FROM `article` WHERE `id` < 475171 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001691s ]
  15. SELECT * FROM `article` WHERE `id` < 475171 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005549s ]
0.237846s