For Piaware SD Card image, there are two alternate scripts (the first and last) . Which one you used and faced problem?
To find where is the problem, I replicate your issue as follows:
(1) Downloaded “piaware-sd-card-3.5.0.img.zip” and unzipped it.
(2) Formatted microSD card, and wrote “piaware-sd-card-3.5.0.img” to it.
TEST-1
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Downloaded following file:
The First one in the list
Optimize-Gain-Piaware-SD-Card-Image.docx -
Created file optimize-gain.py and copy-pasted from downloaded .docx file
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Made the file executable and then ran the file. It worked perfectly well without any error.
TEST-2
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Downloaded following file,
Script for Piaware sd card img by wittrup58.
https://raw.githubusercontent.com/wittrup/piawarebash/master/pyh/optimize-gain-piaware3.py -
Made downloaded file executable, and ran the file. It ran without any problems