Put an extra space into the repr of a Fraction:
Fraction(1, 2) instead of Fraction(1,2).
diff --git a/Lib/fractions.py b/Lib/fractions.py
index 3f070de..123ecb6 100755
--- a/Lib/fractions.py
+++ b/Lib/fractions.py
@@ -187,7 +187,7 @@
 
     def __repr__(self):
         """repr(self)"""
-        return ('Fraction(%r,%r)' % (self.numerator, self.denominator))
+        return ('Fraction(%r, %r)' % (self.numerator, self.denominator))
 
     def __str__(self):
         """str(self)"""