python怎么退出for循环

# 第一种嵌套形式

a = [[1, 2, 3], [5, 5, 6], [7, 8, 9]]

# init_i = 0

# init_j = 0

flag = True

for i in range(3):

    for j in range(3):

        # print(i, j)

        if a[i][j] == 5:

            flag = False

            init_i = i

            init_j = j

            break

    if not flag:

        break

print(init_i, init_j)

print(i, j)

# 第二种嵌套形式

flag = True

while flag:

    for i in range(10):

        print(x)

        flag = False

        break