Python 中的 nested 循环函数

Python编程语言允许在一个循环中使用另一个循环。以下部分显示了几个示例来说明这一概念。

nested loops - 语法

for iterating_var in sequence:
   for iterating_var in sequence:
      statements(s)
   statements(s)

Python编程语言中嵌套的WHILE LOOP语句的语法如下所示:-

while expression:
   while expression:
      statement(s)
   statement(s)

关于循环嵌套的最后一个注意事项是，您可以将任何类型的循环放在任何其他类型的循环中。如，for循环可以在while循环中，反之亦然。

链接：https://www.learnfk.comhttps://www.learnfk.com/python/python-nested-loops.html

来源：LearnFk无涯教程网

nested loops - 示例

下面的程序使用嵌套的FOR循环来查找从2到100-的素数

无涯教程网

#!/usr/bin/python

i=2
while(i < 100):
   j=2
   while(j <= (i/j)):
      if not(i%j): break
      j=j + 1
   if (j > i/j) : print i, " is prime"
   i=i + 1

print "Good bye!"

执行上述代码时，将生成以下输出-

2 is prime
3 is prime
5 is prime
7 is prime
11 is prime
13 is prime
17 is prime
19 is prime
23 is prime
29 is prime
31 is prime
37 is prime
41 is prime
43 is prime
47 is prime
53 is prime
59 is prime
61 is prime
67 is prime
71 is prime
73 is prime
79 is prime
83 is prime
89 is prime
97 is prime
Good bye!