flake8 fixes round 2

Author: akumar01

src/dca/cov_util.py

@@ -251,8 +251,8 @@ def calc_cross_cov_mats_from_data(X, T, mean=None, chunks=None, stride=1,
             cov_est /= (n_samples - 1.)
     else:
         if len(X) <= T:
-            raise ValueError('T must be shorter than the length of the shortest '\
-                             'timeseries. If you are using the DCA model, 2 * DCA.T must be '\
+            raise ValueError('T must be shorter than the length of the shortest '
+                             'timeseries. If you are using the DCA model, 2 * DCA.T must be '
                              'shorter than the shortest timeseries.')
         if mean is None:
             mean = X.mean(axis=0, keepdims=True)