Question

所以我有一个文本文件，如下所示：

a,b,

我想更新列表中的空值，这是我的尝试：

def test():
    z=""
    with open("test.txt","r") as user_file:
        for line in user_file.readlines():
            z = line.split(",")
            print(z)
            print(z[2])
    if z[2] not in["1","2","3"]:
        z[2] =="1"
        level = 1
        with open("test.txt","w") as x:
            x=x.write(str(z))
        return level
    else:
        level = z[2]
        return level
x=test()
print(x)

结果如下：

if z[2] not in["1","2","3"]:
IndexError: string index out of range

我只想覆盖txt文件的[2]部分

Answer 1

您的if z[2] not in["1","2","3"]代码未在for循环内缩进。这意味着它看到z变量设置为""，而不是split

产生的变量

请参阅https://python-textbok.readthedocs.io/en/1.0/Variables_and_Scope.html

更新列表中的空值

1 个答案: