adressed pr review

Author: AdarshDec

lib/matplotlib/axes/_axes.py

@@ -3305,7 +3305,8 @@ def pie(self, x, explode=None, labels=None, colors=None,
 
         if not np.all(np.isfinite(x)):
             raise ValueError('Wedge sizes must be finite numbers')
-
+        
+        sx = x.sum()
 
         if normalize:
             x = x / sx

lib/matplotlib/tests/test_axes.py

@@ -9726,5 +9726,5 @@ def test_pie_non_finite_values():
     fig, ax = plt.subplots()
     df = [5, float('nan'), float('inf')]
 
-    with pytest.raises(ValueError, match = 'Wedge sizes must be finite numbers'):
+    with pytest.raises(ValueError, match='Wedge sizes must be finite numbers'):
         ax.pie(df, labels=['A', 'B', 'C'])