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Python 语法第四课:循环结构

  • 2026-08-20 12:10:37
Python 语法第四课:循环结构

欢迎来到「Python学习与交流」!在前面的课程中,我们让程序学会了说话、倾听和思考。但如果你需要打印 100 次“我爱吃苹果”,难道要复制粘贴 100 行 print 吗?当然不!

今天,我们将赋予程序“重复执行”的超能力——学习 for 循环和 while 循环。掌握了它们,你就能用几行代码搞定成千上万次的重复操作。

一、for 循环:遍历已知序列

当你明确知道要循环多少次,或者要遍历一个集合(如列表、字符串、数字范围)时,for 循环是首选。

1. 遍历数字范围:range()

range() 函数可以生成一个数字序列,常与 for 搭配使用:

# 打印 0 到 4(注意:不包含 5)for i in range(5):    print(f"第 {i+1} 次:我爱Python!")

💡 range() 小技巧

  • range(5) → 0,1,2,3,4
  • range(1, 6) → 1,2,3,4,5(从1开始,到6之前结束)
  • range(0, 10, 2) → 0,2,4,6,8(步长为2)

2. 遍历字符串/列表

for 可以直接取出序列中的每一个元素:
fruits = ["苹果""香蕉""橙子"]for fruit in fruits:    print(f"我喜欢吃{fruit}")

二、while 循环:满足条件就继续

当你不知道要循环多少次,只知道“什么时候该停”时,就用 while。它会一直执行,直到条件变为 False。
count = 0while count < 3:    print(f"当前计数:{count}")    count += 1  # ⚠️ 别忘了更新条件,否则会无限循环!

三、循环控制:break 与 continue

有时候我们需要在循环中途“干预”一下:

  • break:立即跳出整个循环,不再执行后续迭代。
  • continue:跳过本次循环的剩余代码,直接进入下一次迭代。
for i in range(5):    if i == 2:        continue  # 跳过 2,不打印    if i == 4:        break     # 遇到 4 直接退出循环    print(i)      # 输出:0 1 3

四、实战:猜数字小游戏

让我们把四节课的知识融会贯通,写一个完整的互动游戏!

import randomsecret = random.randint(110)attempts = 0print("=== 猜数字游戏(1-10)===")while True:    guess = int(input("请输入你猜的数字:"))    attempts += 1    if guess == secret:        print(f"🎉 恭喜!你用了 {attempts} 次猜对了!")        break  # 猜对后退出循环    elif guess > secret:        print("太大了,再试试!")    else:        print("太小了,再试试!")

五、新手避坑指南

    • 缩进错误
      :循环体内的代码必须统一缩进(推荐4空格),缩进不对会导致逻辑完全错乱。
    • 忘记更新 while 条件
      :这是导致死循环的头号原因,每次写完 while 都要检查条件变量是否在变化。
    • 混淆 for 和 while
      :能用 for 的场景优先用 for,它更安全、更简洁;只有当循环次数不确定时才用 while
    • range 边界问题
      range(n) 生成的数字是 [0, n),不包含 n,这是新手最常犯的 off-by-one 错误。

    六、总结

    • for 循环:适合遍历已知序列或固定次数重复。
    • while 循环:适合条件驱动的未知次数重复。
    • break / continue:精准控制循环的执行流程。
    • 核心原则:优先用 for,慎用 while,时刻警惕死循环。

    至此,你已经掌握了 Python 最核心的四大基础语法:输出、输入、判断、循环下一课,我们将进入全新的篇章——函数,把代码封装成可复用的“工具”。

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    1. CONNECT:[ UseTime:0.000745s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001555s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011601s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008059s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001511s ]
    6. SELECT * FROM `set` [ RunTime:0.001280s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001907s ]
    8. SELECT * FROM `article` WHERE `id` = 506790 LIMIT 1 [ RunTime:0.013011s ]
    9. UPDATE `article` SET `lasttime` = 1787323965 WHERE `id` = 506790 [ RunTime:0.002651s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000689s ]
    11. SELECT * FROM `article` WHERE `id` < 506790 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001734s ]
    12. SELECT * FROM `article` WHERE `id` > 506790 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.055419s ]
    13. SELECT * FROM `article` WHERE `id` < 506790 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.056886s ]
    14. SELECT * FROM `article` WHERE `id` < 506790 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.024697s ]
    15. SELECT * FROM `article` WHERE `id` < 506790 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.094392s ]
    0.425989s