python - AttributeError 'Nonetype' 对象没有属性。但我检查 Nonetype

Question

我得到AttributeError:'NoneType'对象没有属性'rstrip'

所以我添加了 if clist is not None: 但我不断收到相同的错误。为什么？

if clist is not None:
    result = [
        [name, clist.rstrip()] 
        for name, clist in zip(
            fragments[::group_count+1],
            fragments[group_count::group_count+1]
        )
    ]

完整回溯

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Input In [85], in <module>
    120             fragments = fragments[1:]
    121         if clist is not None:
--> 122             result = [
    123                 [name, clist.rstrip()] 
    124                 for name, clist in zip(
    125                     fragments[::group_count+1],
    126                     fragments[group_count::group_count+1]
    127                 )
    128             ]

Input In [85], in <listcomp>(.0)
    120             fragments = fragments[1:]
    121         if clist is not None:
    122             result = [
--> 123                 [name, clist.rstrip()] 
    124                 for name, clist in zip(
    125                     fragments[::group_count+1],
    126                     fragments[group_count::group_count+1]
    127                 )
    128             ]

AttributeError: 'NoneType' object has no attribute 'rstrip'

Answer 1

试试这个。

列表理解之外的 Clist 不是 None 而是 None 中片段内的某些值，这就是您收到此错误的原因。

您需要添加如果 clist 在列表理解中不是 None，如下所示。

result = [[name, clist.rstrip()] for name, clist in zip(
            fragments[::group_count+1],
            fragments[group_count::group_count+1]
        ) if clist is not None]