I ran the following command to remove the #!/usr/bin/python shebang from the first line of files with permissions 644 or 664:

find . -type f \( -perm 644 -o -perm 664 \) -exec sed -i '1{/^#!\/usr\/bin\/python$/d}' {} \;

Only one file tests/test_point.py was left unchanged because it had the shebang commented out:

# #!/usr/bin/python

I removed it manually.

Then, I updated the permissions to 755 for Python files that are executable (i.e., those containing if __name__ == "__main__"):

chmod 755 thumbor/server.py
chmod 755 thumbor/config.py
chmod 755 thumbor/doctor.py
chmod 755 thumbor/url_composer.py