run pyupgrade

_pytest/mark/legacy.py

@@ -17,7 +17,7 @@ class MarkMapping(object):
 
     @classmethod
     def from_item(cls, item):
-        mark_names = set(mark.name for mark in item.iter_markers())
+        mark_names = {mark.name for mark in item.iter_markers()}
         return cls(mark_names)
 
     def __getitem__(self, name):

_pytest/mark/structures.py

@@ -296,7 +296,7 @@ class MarkInfo(object):
         return cls([mark])
 
     def __repr__(self):
-        return "<MarkInfo {0!r}>".format(self.combined)
+        return "<MarkInfo {!r}>".format(self.combined)
 
     def add_mark(self, mark):
         """ add a MarkInfo with the given args and kwargs. """