error as following with python 3.6.2

[Abd2z]

Thank you for your work.

it seems not working with python 3.6 . I got the follwoing error
elif isinstance(keywords, basestring):
NameError: name 'basestring' is not defined

I fond that basestring is not supported anymore in python 3.x

Appreciate your feedback
Thank you

[jrmasiero]

The builtin basestring abstract type was removed. Use str instead. The str and bytes types don’t have functionality enough in common to warrant a shared base class. The 2to3 tool (see below) replaces every occurrence of basestring with str.