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零基础学Python:数字类型玩明白,代码人生不迷路

  • 2026-07-04 17:05:37
零基础学Python:数字类型玩明白,代码人生不迷路

小伙伴们,大家好。我是石有八九。

👇相信:代码有逻辑,人生有算法👇

📍关注我,一起构自己的有序人生。 

欢迎回到《Python程序设计》课堂。一起探索Python的奇妙世界!

今天咱们不讲大道理,只聊最接地气、最常用、最能打的 Python 数字类型。代码要写得稳,数字先得分得清;做人要行得正,逻辑先要立得住 —— 咱们这节课,技术 + 素养双丰收


🎯开篇三问:数字为啥是编程基本功?

  • 统计成绩、算生活费、记步数、算 BMI…… 生活处处是数字

  • 程序 = 数据 + 算法,数字就是数据里的主力军

  • 数字用对,代码少报错、效率高、逻辑干净

老班划重点:数字不乱,思路不慌;类型清晰,人生有序。


🧮Python 数字四大金刚:一学就会,一用就对

Python 官方认证,数字家族主要这4 位成员

  1. int 整型:不带小数点的整数

  2. float 浮点型:带小数点的小数

  3. bool 布尔型:真 / 假,是非分明

  4. complex 复数:理工科专用,了解就行

咱们重点讲前 3 个,考试、项目、生活全能用。


1️⃣ int 整型:做人要正直,数字要整数

✅ 定义

没有小数点、正负数、零都算,Python3 支持无限大整数

✅ 生活案例(零花钱记账本)

# 每天零花钱记录

qian_zao=5

qian_wan=10

total=qian_zao+qian_wan

print("今天一共花:"total"元")

✅ 思政小课堂

整数代表完整、正直、不掺水

做人像 int:真诚不虚假,踏实不浮夸,一步一个脚印走正道。


2️⃣ float 浮点型:精细生活,精准做事

✅ 定义

带小数点,支持科学计数法,用于身高、体重、温度、金额等。

✅ 生活案例(BMI 健康计算)

height=1.75

weight=68.5

bmi=weight/ (height*height)

print("你的BMI指数:"bmi)

✅ 思政小课堂

浮点数代表精准、细致、严谨

科研求真、学习求实、工作求精,差之毫厘谬以千里


3️⃣ bool 布尔型:是非分明,坚守底线

✅ 定义

只有两个值:True / False(首字母必须大写)

本质是 int 子类:True=1,False=0

✅ 生活案例(考勤判断)

is_on_time=True

if is_on_time:

print("准时到校,值得表扬!")

else:

print("下次要早点哦!")

✅ 思政小课堂

布尔就是是非观、原则线

大是大非拎得清,底线红线守得住,做有原则、有担当的新时代青年


4️⃣ complex 复数:理科生专属,简单认识

c=3+4j

print("实部:"c.real)

print("虚部:"c.imag)

工程、信号处理用得多,入门先混个脸熟。


⚙️数字运算:加减乘除,规矩不能乱

a=10

b=3

print(a+b)   # 加

print(a-b)   # 减

print(a*b)   # 乘

print(a/b)   # 除(得float)

print(a//b)  # 整除

print(a%b)   # 取余

print(a**b)  # 幂

老班提醒:先乘除后加减,有括号先算括号,和数学一样守规矩。


🔄类型转换:学会变通,更会坚守原则

显式转换(手动)

int(3.99)    # 3(截断不四舍五入)

float(5)     # 5.0

bool(0)      # False

bool(100)    # True

隐式转换(自动)

整数 + 小数 → 自动变小数

布尔 + 数字 → 自动变 1/0

✅ 思政小课堂

类型可以转换,底线不能转换

适应环境是智慧,坚守初心是品格。


🧪课堂小练习:5 分钟上手

  1. 用 int 算一周零花钱总和

  2. 用 float 算自己的 BMI

  3. 用 bool 判断今天是否完成学习任务

做完你会发现:Python 真的很懂生活


🌟老班总结:数字里的人生道理

  • int:正直踏实,行稳致远

  • float:严谨细致,精益求精

  • bool:明辨是非,坚守底线

  • 运算与转换:守规矩、懂变通、不忘初心

代码写对,是技术;

人做对,是格局。

愿大家学好 Python 数字,更走好人生每一步。


📌下期预告

下节课咱们讲字符串 str:把文字玩出花,把表达练到位!

记得点赞 + 在看 + 收藏,Python 轻松上分!

文章有帮助的话,在看,转发吧。

谢谢支持哟 (*^__^*)

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  1. CONNECT:[ UseTime:0.000472s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000799s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000252s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000604s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000521s ]
  8. SELECT * FROM `article` WHERE `id` = 488782 LIMIT 1 [ RunTime:0.000445s ]
  9. UPDATE `article` SET `lasttime` = 1783159716 WHERE `id` = 488782 [ RunTime:0.013054s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000976s ]
  11. SELECT * FROM `article` WHERE `id` < 488782 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001024s ]
  12. SELECT * FROM `article` WHERE `id` > 488782 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000486s ]
  13. SELECT * FROM `article` WHERE `id` < 488782 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006683s ]
  14. SELECT * FROM `article` WHERE `id` < 488782 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007430s ]
  15. SELECT * FROM `article` WHERE `id` < 488782 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002758s ]
0.104478s