1.1 --- a/lib/__builtins__/set.py Sun Feb 05 18:17:14 2017 +0100
1.2 +++ b/lib/__builtins__/set.py Sun Feb 05 18:18:04 2017 +0100
1.3 @@ -239,7 +239,7 @@
1.4 "Remove from this set all values from 'other'."
1.5
1.6 for value in other:
1.7 - self.remove(value)
1.8 + self.discard(value)
1.9
1.10 def discard(self, value):
1.11
1.12 @@ -254,9 +254,14 @@
1.13
1.14 "Preserve in this set only values in this set found in 'other'."
1.15
1.16 + to_remove = set()
1.17 +
1.18 for value in self:
1.19 if value not in other:
1.20 - self.remove(value)
1.21 + to_remove.add(value)
1.22 +
1.23 + for value in to_remove:
1.24 + self.remove(value)
1.25
1.26 def pop(self):
1.27