syntax error on python 3.8.5

[Marc A. Modrow]

In the csv_parser.py I get a syntax error on line 486, when running on python 3.8.5.
Appearently an is is used, where a == is needed.
This results in a crash.

[Bruno Passeri]

Thanks for the fix.

[Marc A. Modrow]

Thanks for the fix.

Thanks for the project!