BUG: use compression=None (again) to avoid inferring compression by twoertwein · Pull Request #37909 · pandas-dev/pandas (original) (raw)

read_fwf was using compression=None to infer compression (in addition to compression="infer"). This is undocumented but was enforced in a test.

In #37639, I thought this was the expected behavior for all functions. That as wrong, read_csv explicitly states that compression=None does not infer any compression.