python main（）在shell中不执行

Question

我想在main中运行我的flatten（li）函数，但是当我运行该模块时它没有运行。但是当我在shell中输入“flatten（li）”时它正在工作。有任何想法吗？谢谢！

li = [0, 2, [[2, 3], 8, 100, None, [[None]]], -2] 

def flatten(li): 
    i = 0 
    while i < len(li): 
     "only execute if the element is a list" 
     while isinstance(li[i], list): 
      """taking the element at index i and sets it as the 
       i'th part of the list. so if l[i] contains a list 
       it is then unrolled or 'unlisted'""" 
      li[i:i + 1] = li[i] 
     i += 1 

    for element in li: 
     if not element and not isinstance(element, int): 
     li.remove(element) 

    return li 

def main(): 
    flatten(li) 

if __name__ == '__main__': 
    main() 

Answer 1

你不是做与输出任何东西。我不知道你希望看到什么，但这样的事情是你想要什么：

li = [0, 2, [[2, 3], 8, 100, None, [[None]]], -2] 


def flatten(li): 
    i = 0 
    while i < len(li): 
     while isinstance(li[i], list): 
      li[i:i + 1] = li[i] 
     i += 1 

    for element in li: 
     if not element and not isinstance(element, int): 
      li.remove(element) 

    return li 


def main(): 
    flat = flatten(li) 
    print(flat) 


if __name__ == '__main__': 
    main() 

Answer 2

它的工作，当然 - 你只是不打印任何东西，所以你什么都看不到。尝试添加print电话：

if __name__ == '__main__': 
    main() 
    print(li)