I ran pythonfuzz on clevercsv's detection engine, and got many input samples resulting in unexpected exceptions, e.g. a file just containing three double-quotes results in a SystemError:

clevercsv detect doublequote-doublequote-doublequote.csv 

[SystemError]
PyEval_EvalFrameEx returned a result with an error set

I'm using clevercsv 0.5.3 from pypi with Python 3.7 running on Ubuntu 19.10.

I've attached a ZIP file containing the fuzzing script and some sample input files leading to unexpected exceptions.

clevercsv-fuzzing.zip