Improve perfomance of UUID.hex and UUID.__str__ by using bytes.hex()

Author: booqoffsky

Lib/uuid.py

@@ -321,9 +321,8 @@ def __setattr__(self, name, value):
         raise TypeError('UUID objects are immutable')
 
     def __str__(self):
-        hex = '%032x' % self.int
-        return '%s-%s-%s-%s-%s' % (
-            hex[:8], hex[8:12], hex[12:16], hex[16:20], hex[20:])
+        hex = self.hex
+        return f'{hex[:8]}-{hex[8:12]}-{hex[12:16]}-{hex[16:20]}-{hex[20:]}'
 
     @property
     def bytes(self):
@@ -387,7 +386,7 @@ def node(self):
 
     @property
     def hex(self):
-        return '%032x' % self.int
+        return self.bytes.hex()
 
     @property
     def urn(self):