getting error basestring is not defined

[ninjakx]

Line no. 101-102 of the export.py

    elif isinstance(out_file, basestring):
        out_file = open(out_file, "w")

[LeapFrogAndy]

行号 export.py的101-102

elif isinstance(out_file, basestring):
    out_file = open(out_file, "w")

basestring未定义