python提示AttributeError: ‘NoneType‘ object has no attribute ‘append‘

Python问题——AttributeError: ‘NoneType‘ object has no attribute ‘append‘

f=open("data.csv")for line in f:    line = line.strip("\n")    ls = line.split(",")    lt=[]    for word in ls:        word=word.strip()        lt=lt.append(word)

    print(",".join(lt))f.close()

把lt= lt.append(word)改为lt.append(word)后问题解决。

原因：append会修改a本身，并且返回None。不能把返回值再赋值给a。

Python问题——AttributeError: 'NoneType' object has no attribute 'append'

原文地址：https://www.cnblogs.com/oycc2000/p/11279677.html