Per A. Brodtkorb 426258b7b7 Adding missing close for open and replaced "fid=open(filename) fid.close()" ...

statements with the safer "with open(filename) as fid:" blocks.

Also removed unnecessary "try: ... finally: pass" statements
and refactored code from img2py function into _write_image and _replace_non_alphanumeric_with_underscore

Fixes #1574

2020-03-25 10:36:38 +01:00

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