Sped ._update() method by factoring try/except out of the inner loop.
diff --git a/Lib/sets.py b/Lib/sets.py
index 6245d53..bb44280 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -280,13 +280,14 @@
def _update(self, iterable):
# The main loop for update() and the subclass __init__() methods.
- # XXX This can be optimized a bit by first trying the loop
- # without setting up a try/except for each element.
data = self._data
value = True
- for element in iterable:
+ it = iter(iterable)
+ while True:
try:
- data[element] = value
+ for element in it:
+ data[element] = value
+ return
except TypeError:
transform = getattr(element, "_as_immutable", None)
if transform is None: