Python 3.7.7 - NameError: name 'basestring' is not defined

[ggzheng]

I used Phthon 3.7.7 and bedtools 2.27.1. The program was fine if no region was identified, but ran into errors for further steps if any region was identified. An error message was reported as below

File "XXX/cruzdb/sqlsoup.py", line 208, in init
elif isinstance(engine_or_metadata, (basestring, Engine)):
NameError: name 'basestring' is not defined

I wonder if basestring is still available in Python 3.