View difference between Paste ID: Uf9r6Exg and Vuj9xPGf

 from typing import Tuple
 
 
 def parse_optional_alpha(colour) -> Tuple[int]:
-    if not isinstance(colour, (list, tuple)):
+    if not isinstance(colour, (list, tuple)) or len(colour) not in (3, 4):
         raise ValueError("Unknown colour info.")
 
-    if len(colour) not in (3, 4):
+
         r, g, b, a = colour
         return (r, g, b, a)
     except ValueError:
         return (*colour, 0)
 
 
 def normalise_colour_info(colour) -> Tuple[str, Tuple[int, int, int, int]]:
     """Normalise colour info to (name, (r, g, b, alpha))."""
 
-def normalise_colour_info(colour):
+
         try:
             return ("", parse_optional_alpha(colour))
         except ValueError as e:
             raise e
 
     try:
         name, values = colour
     except ValueError:
         raise ValueError("Unknown colour info.")
 
     return (name, parse_optional_alpha(values))
 
 
 assert normalise_colour_info(("a", (1, 2, 3))) == ("a", (1, 2, 3, 0))
 assert normalise_colour_info(("a", (1, 2, 3, 4))) == ("a", (1, 2, 3, 4))
 assert normalise_colour_info((1, 2, 3, 4)) == ("", (1, 2, 3, 4))
 assert normalise_colour_info((1, 2, 3)) == ("", (1, 2, 3, 0))