正如注释中所述，在处理CSV文件时，您确实应该使用Python的内置 csv模块（似乎链接到Python 2文档

As noted in the comments, when dealing with CSV files you truly ought to use Python's built-in csv module (linking to Python 2 docs since it seems that's what you're using).

另外要注意的是，当您这样做时：

Another thing to note is that when you do:

data = line.split（csvDelimiter）

返回列表中的每个项目，如果不为空，则为字符串。在循环中进行类型检查没有任何意义（尽管如果有原因，您会使用 isinstance ）。尽管您可能使用了unicode字符串，但我不知道对此有什么解决办法。在Python 2上，通常可以使用 isinstance（...，basestring），其中 basestring 是两个 str 和 unicode 。在Python 3上，只需使用 str ，除非您知道要处理的是 bytes 。

every item in the returned list, if it is not empty, will be strings. There's no sense in doing a type check in the loop (though if there were a reason to you would use isinstance). I don't know what "didn't work" about it, though it's possible you were using unicode strings. On Python 2 you can usually use isinstance(..., basestring) where basestring is a base class for both str and unicode. On Python 3 just use str unless you know you're dealing with bytes.