python if and same instruction line not working

[pascal z via Python-list]

I need to change the script commented out to the one not commented out. Why?

    # for x in sorted (fr, key=str.lower):
    #     tmpstr = x.rpartition(';')[2]
    #     if x != csv_contents and tmpstr == "folder\n":
    #         csv_contentsB += x
    #     elif x != csv_contents and tmpstr == "files\n":
    #         csv_contentsC += x

    for x in sorted (fr, key=str.lower):
        if x != csv_contents:
            tmpstr = x.rpartition(';')[2]
            if tmpstr == "folder\n":
                csv_contentsB += x
            elif tmpstr == "file\n":
                csv_contentsC += x
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