Merge pull request #1550 from ganga-devs/mesmith75-patch-1

Update fill_gpi.py

Author: mesmith75

doc/fill_gpi.py

@@ -77,7 +77,7 @@ def signature(func, name=None):
     # we get args=['a', 'b', 'c', 'd'] and defaults=['None', '4']
     # We must match them backwards from the end and pad the beginning with None
     # to get arg_pairs=[('a', None), ('b', None), ('c', 'None'), ('d', '4')]
-    arg_pairs = reversed([(a, d) for a, d in izip_longest(reversed(args), reversed(defaults), fillvalue=None)])
+    arg_pairs = reversed([(a, d) for a, d in zip_longest(reversed(args), reversed(defaults), fillvalue=None)])
     # Based on arg_pairs we convert it into
     # arg_strings=['a', 'b', 'a=None', 'd=4']
     arg_strings = []