for 循环

exit_flag = False

for i in range(10):
    if i <5:
        continue     ##继续循环下一次，后面不执行
    print(i)
    for j in range(10):
        print("layer2",j)
        if j == 6:
            exit_flag = True   ###标记
            break   ####跳出本次for循环
    if exit_flag:   ### 等同于exit_flag = false，因为开头赋值未False
        break