Grant the execute permission to the group.

  ls -l example.py
  -rw-r--r-- 1 pi pi 4452 Jul 25 18:01 example.py
  chmod g+x example.py --- g is for group, x is for execute
  ls -l example.py
  
  -rw-r-xr-- 1 pi pi 4452 Jul 25 18:01 example.py

  The group rights have changed from ----r------ ----r-x---