Update dual_number_automatic_differentiation.py

Author: cclauss

maths/dual_number_automatic_differentiation.py

@@ -17,10 +17,8 @@ def __init__(self, real, rank):
             self.duals = rank
 
     def __repr__(self):
-        return (
-            f"{self.real}+"
-            f"{'+'.join('{}E{}'.format(dual, n) for n, dual in enumerate(self.duals, 1))}"
-        )
+        s = "+".join(f"{dual}E{n}" for n, dual in enumerate(self.duals, 1))
+        return f"{self.real}+{s}"
 
     def reduce(self):
         cur = self.duals.copy()