bpo-30296 Remove unnecessary tuples, lists, sets, and dicts (#1489)

* Replaced list(<generator expression>) with list comprehension
* Replaced dict(<generator expression>) with dict comprehension
* Replaced set(<list literal>) with set literal
* Replaced builtin func(<list comprehension>) with func(<generator
  expression>) when supported (e.g. any(), all(), tuple(), min(), &
  max())

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/_weakrefset.py b/Lib/_weakrefset.py
index 4d0de8c..304c66f 100644
--- a/Lib/_weakrefset.py
+++ b/Lib/_weakrefset.py
@@ -157,19 +157,19 @@ class WeakSet:
     __le__ = issubset
 
     def __lt__(self, other):
-        return self.data < set(ref(item) for item in other)
+        return self.data < set(map(ref, other))
 
     def issuperset(self, other):
         return self.data.issuperset(ref(item) for item in other)
     __ge__ = issuperset
 
     def __gt__(self, other):
-        return self.data > set(ref(item) for item in other)
+        return self.data > set(map(ref, other))
 
     def __eq__(self, other):
         if not isinstance(other, self.__class__):
             return NotImplemented
-        return self.data == set(ref(item) for item in other)
+        return self.data == set(map(ref, other))
 
     def symmetric_difference(self, other):
         newset = self.copy()