python - Simply Getting instance of a class with "init(self)" method in Python

Question

I'm new to python and I can't get instance of the class below Which is in a python file named "util.py":

...
class Stack:
    def __init__(self):
        self.list = []
...

And I'm trying to construct an instance of the aforementioned class in another python file named "Search.py";Here's the code :

def depthFirstSearch(problem):

   from util import Stack

   path = [] #list used to return the desired actions

   DFSstack = Stack()

There's really nothing more in my code believe me!:) But I get this error : TypeError: 'NoneType' object is not iterable

Help me out please!

score 1 · Accepted Answer

你不需要__init__直接打电话；打电话给班级：

>>> class Stack:
...     def __init__(self):
...         self.list = []
... 
>>> DFSstack = Stack()

然后__init__将自动调用初始化方法。

score 0 · Accepted Answer

为什么不让 Stack 从列表中继承？它的工作原理几乎与列表相同，但您可以向其中添加自己的方法。

class Stack(list):
    pass

python - Simply Getting instance of a class with "__init__(self)" method in Python