两层for 循环执行顺序 python

在Python中，两层for循环的执行顺序是外层循环先执行一次，然后内层循环完全执行完毕，再执行外层循环的下一次迭代。具体来说，外层循环的每一次迭代都会完整地执行内层循环的所有迭代。只有当内层循环执行完毕后，才会执行外层循环的下一次迭代。这种嵌套循环的执行顺序可以通过以下示例代码来说明：

for i in range(3):
    print("i =", i)
    for j in range(2):
        print("\tj =", j)
    print("内层循环结束")
print("外层循环结束")

输出结果为：

i = 0
    j = 0
    j = 1
内层循环结束
i = 1
    j = 0
    j = 1
内层循环结束
i = 2
    j = 0
    j = 1
内层循环结束
外层循环结束

可以看到，内层循环完全执行完毕后，才会执行外层循环的下一次迭代。这种执行顺序可以帮助我们理解和控制嵌套循环的逻辑。\[1\]\[3\]
#### 引用[.reference_title]
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