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求助

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随

#1 Created at ... [Delete] [Delete and Lock User] 
def add_end(L=None):
    if L is None:
        L = []
    L.append('END')
    return L

if L=None:
        ^
SyntaxError: invalid syntax

大家有出现这个情况吗

LA LA LAND

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

第一行是 L=None

第二行是 L is None

一个是 = 

一个是 is 

不一样

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