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一起学Python(007):Python赋值语句轻松入门@每日饮水记录器

  • 2026-03-27 21:21:09
一起学Python(007):Python赋值语句轻松入门@每日饮水记录器

很多初学者第一次看到=时,会自然地把它理解成数学里的“等于”。但在Python的世界里,这个符号有一个更重要的身份——赋值

今天,我们就通过一个“每日饮水记录器”的案例,彻底搞懂赋值语句的奥秘。

赋值语句是什么?

先看一行最简单的代码:

water = 8

这行代码的意思是:把数字8赋值给变量water。

关键区别:

数学中的=表示“相等”(左边等于右边)

Python中的=表示“把右边的值放入左边的变量中”

变量就像水杯上的标签,赋值就是把水量写在标签上。

生活案例:每日饮水记录器

每天喝够8杯水对身体好。我们用一个简单的程序来记录饮水量。

# 每日饮水记录器

# 设置目标

target = 8                    # 赋值:目标饮水量8杯

# 记录已喝水量

morning = 2                   # 赋值:上午喝了2杯

afternoon = 3                 # 赋值:下午喝了3杯

evening = 1                   # 赋值:晚上喝了1杯

# 计算总量

total = morning + afternoon + evening #表达式赋值:先计算总量,再存入total

# 计算还需多少杯

need = target - total #表达式赋值计算还差几杯,存入need

# 输出结果

print("=" * 25)

print("今日饮水记录")

print("=" * 25)

print(f"上午:{morning}杯")

print(f"下午:{afternoon}杯")

print(f"晚上:{evening}杯")

print(f"总计:{total}杯")

print(f"还需:{need}杯")

print("=" * 25)

判断是否达标,给出建议

if need <= 0:

    print("🎉 达标!喝得够多!") #输出记录,{变量}用于嵌入变量值

else:

    print(f"💧 再喝{need}杯就达标啦!")

运行结果

赋值语句的三种常见形式

1. 直接赋值

作用:给变量一个具体的值

场景:设定初始值、存储固定数据

name = "张三"      # 字符串

age = 18           # 整数

height = 1.75      # 浮点数

is_ok = True       # 布尔值

2. 表达式赋值

作用:把计算结果存进变量

场景:算术运算、字符串拼接、条件判断

total = a + b              # 算术

greeting = "你好," + name  # 拼接

is_adult = age >= 18       # 比较

3. 多重赋值

作用:一次给多个变量赋值

场景:交换变量、函数返回多个值

a, b = 1, 2                # 同时赋值

name, age = "张三", 18

直接赋值是“给值”,表达式赋值是“算完给”,多重赋值是“一次给多个”。

升级版:交互式饮水记录

完整代码:

# 交互式饮水记录器

print("=" * 25) #字符串乘法,把=复25次,生成25个等号,输出一条装饰线,让界面更好看

print("   饮水记录器") #前面的空格是缩进,让标题居中一点

print("=" * 25)

target = int(input("目标杯数(建议8杯):")) #int函数将字符串转换成整数,并把转换后的整数赋值给变量target,作用是让用户输入每天要喝多少杯水,存到target

morning = int(input("上午喝了几杯?"))

afternoon = int(input("下午喝了几杯?"))

evening = int(input("晚上喝了几杯?"))

total = morning + afternoon + evening #把三个数字相加,结果赋值给total

need = target - total #结果赋值给need,如果是正数,说明还差多少杯;如果是0或负数,说明达标或超额

print("\n" + "=" * 25) #\n换行符,先空一行;+字符串拼接,把换行符和分隔线连在一起;输出结果前先空一行,让输出更清晰

print(f"总计:{total}杯") #f"..."格式化字符串,并把变量total的值嵌入字符串中

print(f"还需:{need}杯")

print("=" * 25)

if need <= 0:

    print("🎉 达标!喝得够多!")

else:

    print(f"💧 再喝{need}杯就达标啦!")

赋值语句是Python编程的基石。记住三个核心点:

    =是赋值,不是数学等号

    先定义后使用,变量必须先赋值再使用

    见名知意,变量名要能表达含义

动手试试吧

1. 基础题:定义变量存储你今天的饮水量(早、中、晚),计算总量并输出。

2. 进阶题:编写程序,输入语文、数学、英语三科成绩,用赋值语句计算总分和平均分。

3. 挑战题:编写“热量计算器”,输入三种食物的热量值,计算总热量。如果超过2000卡,输出“超标了”;否则输出“热量正常”。

【上周答案公布】成绩评定案例

#基础题:修改程序,增加“优秀”的细分:90-94为“优秀”,95-100为“卓越”

score=int(input("请输入你的成绩:"))

if score >=95:

    print("卓越!")

elif score>=90:

    print("优秀!")

elif score >=80:

    print("良好!")

elif score >=70:

    print("中等!")

elif score >=60:

    print("及格!")

else:

    print("不及格,下次加油!")

#进阶题:增加一个条件,如果成绩是整数但不是百分制(比如101),提示“成绩无效”

score=int(input("请输入你的成绩:"))

if score >100:

    print("成绩无效!")

elif score >=95:

    print("卓越!")

elif score>=90:

    print("优秀!")

elif score >=80:

    print("良好!")

elif score >=70:

    print("中等!")

elif score >=60:

    print("及格!")

else:

    print("不及格,下次加油!")

#挑战题:增加一个功能,输入负数时,提示“成绩不能为负数”,并让用户重新输入(需要用到循环)

while True:

    score = int(input("请输入你的成绩:"))

    if score < 0:

        print("❌ 成绩不能为负数!请重新输入。")

        continue                    # 跳过本次循环剩余代码,重新输入

    elif score > 100:

        print("❌ 成绩不能超过100分!请重新输入。")

        continue                    # 跳过本次循环剩余代码,重新输入

    else:

        break                       # 输入有效,退出循环

if score >= 95:

    print("卓越!")

elif score >= 90:

    print("优秀!")

elif score >= 80:

    print("良好!")

elif score >= 70:

    print("中等!")

elif score >= 60:

    print("及格!")

else:

    print("不及格,下次加油!")

精彩回顾:

一起学Python(006):分支控制结构让程序学会“做选择”@成绩评定案例

一起学Python(005):从斐波那契数列看循环控制结构

一起学Python(004):Python程序三种控制结构:顺序、分支和循环

一起学Python(003):Python代码书写规则:那些让程序崩溃的“小细节”

一起学Python(002):计算机的“数字秘密”——0和1如何统治世界?

一起学Python(001):为什么文科生也要学Python?

欢迎【点赞】+【转发】❤️

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  1. CONNECT:[ UseTime:0.001084s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001501s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000661s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000671s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001322s ]
  6. SELECT * FROM `set` [ RunTime:0.000620s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001470s ]
  8. SELECT * FROM `article` WHERE `id` = 483408 LIMIT 1 [ RunTime:0.003811s ]
  9. UPDATE `article` SET `lasttime` = 1774644032 WHERE `id` = 483408 [ RunTime:0.006347s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000678s ]
  11. SELECT * FROM `article` WHERE `id` < 483408 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001042s ]
  12. SELECT * FROM `article` WHERE `id` > 483408 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001046s ]
  13. SELECT * FROM `article` WHERE `id` < 483408 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001596s ]
  14. SELECT * FROM `article` WHERE `id` < 483408 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001896s ]
  15. SELECT * FROM `article` WHERE `id` < 483408 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007013s ]
0.193974s