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Why?

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用户5868763182

#1 Created at ... [Delete] [Delete and Lock User] 
def a(L=[]):
    L.append('END')
    return L
print(a())
>>>['END']

def a(L=[]):
    L.append('END')
    return L
print(a(),a())
>>>['END','END'] ['END','END']

def a(L=[]):
    L.append('END')
    return L
print(a(),a(),a())
>>>['END','END','END'] ['END','END','END'] ['END','END','END']

...

用户6311608765

#2 Created at ... [Delete] [Delete and Lock User]

需指向不变参数。 def a(L=None): if L is None: L=[] L.append('end') return L print(a()) print(a())

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