matplotlib
diff --git a/‎examples/pylab_examples/arrow_demo.py
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diff --git a/‎lib/matplotlib/transforms.py
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@@ -162,7 +162,6 @@ def draw_arrow(pair, alpha=alpha, ec=ec, labelcolor=labelcolor):
                                                       max_head_length)
         else:
             length = max_arrow_length
-        
         # set the transparency of the arrow
         if display == 'alpha':
             alpha = min(data[pair]/sf, alpha)
 
@@ -1305,7 +1305,6 @@ def transform(self, values):
             return res.reshape(-1)
         elif ndim == 2:
             return res
-        
         raise ValueError(
             "Input values must have shape (N x {dims}) "
             "or ({dims}).".format(dims=self.input_dims))