不知何故,在下面的 Node 类中,wordList
and adjacencyList
变量在 Node 的所有实例之间共享。
>>> class Node:
... def __init__(self, wordList = [], adjacencyList = []):
... self.wordList = wordList
... self.adjacencyList = adjacencyList
...
>>> a = Node()
>>> b = Node()
>>> a.wordList.append("hahaha")
>>> b.wordList
['hahaha']
>>> b.adjacencyList.append("hoho")
>>> a.adjacencyList
['hoho']
有什么方法可以继续使用构造函数参数的默认值(在本例中为空列表),但同时获取两者a
and b
拥有自己的wordList
and adjacencyList
变量?
我正在使用 python 3.1.2。
可变的默认参数通常不会执行您想要的操作。相反,试试这个:
class Node:
def __init__(self, wordList=None, adjacencyList=None):
if wordList is None:
self.wordList = []
else:
self.wordList = wordList
if adjacencyList is None:
self.adjacencyList = []
else:
self.adjacencyList = adjacencyList
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