Minor formatting fix

Author: PierreRaybaut

qwt/plot_series.py

@@ -238,7 +238,7 @@ def __init__(self, x=None, y=None, size=None, finite=None):
             x = np.resize(x, (size,))
             y = np.resize(y, (size,))
         if len(x) != len(y):
-            minlen = min(len(x),len(y))
+            minlen = min(len(x), len(y))
             x = np.resize(x, (minlen, ))
             y = np.resize(y, (minlen, ))
         if finite if finite is not None else True: