I do not understand the concept of how I can pop an integer from a stack and convert it into binary.

I successfully created a program that can take in an integer and convert it to binary by pushing it into an array using stack but I am not sure how I can make my input a stack itself where I can pop each integer in a stack and then push them into an array to change it into binary.

class ArrayStack: #puts in and removes from the top only
    def __init__(self):
        self._data = [ ]

    def __len__(self):
        return len(self._data)
    
    def is_empty(self):
        return len(self._data) == 0
    
    def push(self, e):
        self._data.append(e)

    def top(self):
        if self.is_empty( ):
            raise Exception("No Elements in Stack")
        return self._data[-1]
    
    def pop(self):
        if self.is_empty( ):
            raise Exception("No Elements in Stack")
        return self._data.pop() 
    

def decToBin(num):
    stack = ArrayStack()
    while num > 0:
        remainder = num % 2
        stack.push(remainder)
        num = num // 2

    _str = ''
    while not stack.is_empty():
        Bin = stack.pop()
        _str = _str + str(Bin)
    return int(_str)

if __name__ == "__main__":
    print(decToBin(65536))