This script renames all PascalCase python files in the current directory into camel_case version.

mv_py_camel_case.sh

#!/usr/bin/env bash

# This script renames all PascalCase python files in the current directory into camel_case version.
# Note: gsed is the GNU sed; on macOS install with `brew install gnu-sed`

for path in $(find . -maxdepth 1 -regex '\./[A-Z].*\.py')
do
    pascal_case=$(echo $path | cut -c 3-)
    camel_case=$(echo $pascal_case | gsed -E 's/([A-Z])/_\L\1/g' | cut -c 2-)
    git mv $pascal_case $camel_case
done