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从零开始学python-break与continue语句

  • 2026-02-11 19:34:07
从零开始学python-break与continue语句

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前言:

   主要分享的是Python版本为Python3的内容。

在Python编程中,break和continue是两个常用的流程控制语句,它们用于改变循环的正常执行顺序。

一、核心语法

语句
语法格式
作用范围
功能说明
breakbreakfor
 / while 循环内
立即终止当前所在循环,跳出循环体
continuecontinuefor
 / while 循环内
跳过本次迭代剩余代码,直接进入下一次循环

⚠️ 注意事项:

  • 二者仅能在循环体内使用,独立使用或置于非循环结构(如普通 if)中会引发 SyntaxError

  • 在嵌套循环中,仅影响其直接所在的最内层循环

  • 均为 Python 关键字,不可用作变量名

二、break 语句:终止循环

🌌作用

break语句用于完全终止当前循环,跳出整个循环体,继续执行循环之后的代码。

📖使用场景

  • 当满足某个条件时提前结束循环

  • 搜索操作中找到目标后立即退出

  • 处理错误或异常情况需要中断循环

🎭示例 1:for 循环中提前终止

for i in range(10):    if i == 5:        break    print(i, end=' ')

✅ 输出:0 1 2 3 4

(循环在 i=5 时终止,5 及之后数字不输出)

示例 2:while 循环 + 无限循环安全退出

count = 0while True:  # 无限循环模板    print(count, end=' ')    count += 1    if count >= 5:        break

✅ 输出:0 1 2 3 4

(通过 break 安全退出 while True,避免死循环)

示例 3:嵌套循环中 break 的作用范围

for i in range(2):    for j in range(3):        if j == 1:            break        print(f"({i},{j})", end=' ')

✅ 输出:(0,0) (1,0)

(break 仅跳出内层 j 循环,外层 i 循环继续)

三、continue 语句:跳过本次迭代

🎯作用

continue语句用于跳过当前循环的剩余语句,直接进入下一次循环迭代。

🧭使用场景

  • 跳过不符合条件的迭代

  • 忽略特定值的处理

  • 在循环中实现条件过滤

示例 1:跳过偶数(for 循环

for i in range(10):    if i % 2 == 0:        continue    print(i, end=' ')

✅ 输出:1 3 5 7 9

(偶数被跳过,仅输出奇数)

示例 2:while 循环中安全使用 continue(关键!)

count = 0while count < 5:    count += 1  # ✅ 先更新循环变量!    if count == 3:        continue    print(count, end=' ')

✅ 输出:1 2 4 5

⚠️避坑提示:若将 count += 1 放在 continue 之后,当 count==3 时将陷入死循环!务必确保循环条件变量在 continue 前更新。

示例 3:嵌套循环中 continue 的作用

for i in range(2):    for j in range(3):        if j == 1:            continue        print(f"[{i},{j}]", end=' ')

✅ 输出[0,0] [0,2] [1,0] [1,2]
(每次 j==1 时跳过打印,但内外层循环均继续)

四、break vs continue:核心对比

特性
breakcontinue
执行效果
完全退出循环
仅跳过当前迭代
循环继续?
是(进入下一轮)
嵌套循环影响
仅最内层
仅最内层
典型场景
找到目标即停止、异常中断
过滤无效数据、条件跳过
与 else 配合
触发 break 时,循环的 else 块不执行
不影响 else 块执行(循环正常结束时触发)

💡 循环 else 小知识:

for x in [1,2,3]:    if x == 0:        breakelse:    print("未触发 break")  # 此行会执行

五、实战综合示例:数据清洗场景

data = [10015, -520025]print("处理结果:")for num in data:    if num == 0:        print(f"  跳过 0")        continue  # 跳过无效值    if num < 0:        print(f"  遇到负数 {num},终止处理")        break     # 遇到异常数据终止    print(f"  处理: {num}")else:    print("✓ 所有有效数据处理完毕")

✅ 输出:

处理结果:  处理: 10  跳过 0  处理: 15  遇到负数 -5,终止处理

(break 触发后,循环 else 块不执行)

六、最佳实践与避坑指南

1、避免无限循环

①. 正确使用break避免无限循环counter = 0while True:  # 无限循环    counter += 1    if counter > 5:        print("达到最大计数,退出循环")        break    print(f"计数: {counter}")

2、嵌套循环跳出多层?

     break 仅跳出一层。如需跳出多层,可:

  •    使用标志变量(flag)

  •    封装为函数 + return

  •  (高级)使用异常(不推荐常规场景)

3、可读性优先

     避免过度嵌套 break/continue。复杂逻辑可考虑:

不推荐:深层嵌套for x in items:    if cond1:        if cond2:            continue推荐:提前返回或重构valid_items = [x for x in items if not (cond1 and cond2)]

4、调试技巧

     在 break/continue 前添加 print(f"Debug: i={i}"),快速定位跳转逻辑。

七、总结

  • break:“到此为止” —— 满足条件立即退出循环

  • continue:“本次跳过” —— 跳过当前迭代,继续下一轮

  • 二者是编写高效、健壮循环逻辑的必备工具

  • 牢记作用范围、更新循环变量、警惕嵌套陷阱

  • 结合 else 子句可实现“循环是否被中断”的优雅判断

【微语】放过自己,不是摆烂,是承认“我尽力了,剩下的不归我管”。

网虫root

期待你的

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  1. CONNECT:[ UseTime:0.000926s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001733s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000709s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000716s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001634s ]
  6. SELECT * FROM `set` [ RunTime:0.000645s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001800s ]
  8. SELECT * FROM `article` WHERE `id` = 475086 LIMIT 1 [ RunTime:0.011525s ]
  9. UPDATE `article` SET `lasttime` = 1770874479 WHERE `id` = 475086 [ RunTime:0.022381s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000655s ]
  11. SELECT * FROM `article` WHERE `id` < 475086 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001045s ]
  12. SELECT * FROM `article` WHERE `id` > 475086 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004136s ]
  13. SELECT * FROM `article` WHERE `id` < 475086 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001485s ]
  14. SELECT * FROM `article` WHERE `id` < 475086 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001374s ]
  15. SELECT * FROM `article` WHERE `id` < 475086 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003910s ]
0.153732s