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一文看懂Python循环嵌套:从入门到实战,新手也能秒懂!

  • 2026-07-02 04:23:13
一文看懂Python循环嵌套:从入门到实战,新手也能秒懂!
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循环嵌套是Python编程里最常用、最核心的知识点,简单说就是循环里套循环

日常写代码、做项目、刷算法题,打印图形、遍历表格、处理多层数据……全都离不开它!

今天用超通俗的语言+6个经典实战案例,把循环嵌套讲得明明白白,新手直接抄作业也能学会!


一、什么是循环嵌套?

循环嵌套 = 外层循环执行一次,内层循环完整执行一遍

语法格式(for/while都能嵌套):

# for 循环嵌套(最常用)
for 外层变量 in 序列:
# 外层循环代码
for 内层变量 in 序列:
# 内层循环代码

核心口诀: 外层管行数,内层管列数/每行内容先走完内层所有循环,再回到外层走下一次


二、基础案例1:打印最简单的嵌套规律

先看一个最直观的例子,帮你理解执行顺序:

# 外层循环跑2次
for i in range(13):
    print(f"外层循环:第{i}次")

# 内层循环跑3次
for j in range(14):
        print(f"  内层循环:第{j}次")

运行结果

外层循环:第1次
  内层循环:第1次
  内层循环:第2次
  内层循环:第3次
外层循环:第2次
  内层循环:第1次
  内层循环:第2次
  内层循环:第3次

✅ 结论: 外层1次 → 内层完整跑1圈,这就是循环嵌套的执行逻辑!


三、经典案例2:打印矩形星号(新手必练)

这是循环嵌套入门第一题,用来练手最合适!

# 打印 3行4列 的矩形
for i in range(3):       # 外层:控制行数(3行)
for j in range(4):   # 内层:控制每行星号数量(4个)
        print("*", end=""# end="" 不换行
    print()  # 一行打印完,换行

运行结果

****
****
****

四、经典案例3:打印直角三角形(进阶必学)

内层循环次数跟着外层变化,就能打印出三角形:

# 打印5行直角三角形
for i in range(16):
# 内层:第i行打印i个星号
for j in range(i):
        print("*", end="")
    print()

运行结果

*
**
***
****
*****

五、经典案例4:打印99乘法表(面试高频)

循环嵌套最经典的案例,面试、作业必考

# 99乘法表
for i in range(110):
for j in range(1, i+1):
# 格式化输出算式
        print(f"{j}×{i}={i*j}", end="\t")
    print()

运行结果

1×1=1 
1×2=2 2×2=4 
1×3=3 2×3=6 3×3=9 
……

六、实战案例5:遍历二维列表(工作常用)

实际开发中,表格数据、二维数组都用嵌套循环遍历:

# 模拟一个班级成绩表(二维列表)
scores = [
    ["小明"9085],
    ["小红"9592],
    ["小刚"8890]
]

# 循环嵌套遍历
for row in scores:          # 外层:遍历每一行
for item in row:        # 内层:遍历每一行里的元素
        print(item, end="\t")
    print()

运行结果

小明 90 85 
小红 95 92 
小刚 88 90 

七、实战案例6:循环嵌套+条件判断(综合应用)

嵌套循环里加if判断,能实现更灵活的逻辑:

# 打印 1~3 行,只打印偶数列星号
for i in range(14):
for j in range(15):
if j % 2 == 0:  # 只打印偶数列
            print("*", end="")
else:
            print(" ", end="")
    print()

运行结果

 * 
 * 
 * 

八、循环嵌套3个核心注意事项

  1. 缩进必须正确:内层循环要比外层多缩进4个空格
  2. 避免死循环:while嵌套时,一定要更新计数器
  3. 控制循环层数:日常开发尽量≤2层,层数多了会变慢

九、总结(一句话记住循环嵌套)

✅ 外层走一次,内层走一圈✅ 外层管,内层管✅ 打印图形、遍历数据、算法逻辑,全靠它!

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  1. CONNECT:[ UseTime:0.000587s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000794s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000271s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003208s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000486s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000684s ]
  8. SELECT * FROM `article` WHERE `id` = 487634 LIMIT 1 [ RunTime:0.002467s ]
  9. UPDATE `article` SET `lasttime` = 1783144443 WHERE `id` = 487634 [ RunTime:0.013600s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000843s ]
  11. SELECT * FROM `article` WHERE `id` < 487634 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000964s ]
  12. SELECT * FROM `article` WHERE `id` > 487634 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000499s ]
  13. SELECT * FROM `article` WHERE `id` < 487634 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.029429s ]
  14. SELECT * FROM `article` WHERE `id` < 487634 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.037588s ]
  15. SELECT * FROM `article` WHERE `id` < 487634 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.021895s ]
0.188316s