style: missing docstring

src/polyA_classifier/cli.py

@@ -11,6 +11,7 @@ parser.add_argument('-p', '--path', action='store', help='Path to state-dict for
 
 
 def main():
+    """Execute poly(A) classifier from shell."""
     args = parser.parse_args()
 
     if args.data[0] == '[':