Python gzip refuses to read uncompressed file

Question

I seem to remember that the Python gzip module previously allowed you to read non-gzipped files transparently. This was really useful, as it allowed to read an input file wh

Answer 1

Maybe you're thinking of zless or zgrep, which will open compressed or uncompressed files without complaining.

Can you trust that the file name ends in .gz?

if file_name.endswith('.gz'):
    opener = gzip.open
else:
    opener = open

with opener(file_name, 'r') as f:
    ...