Fix PEP8 violations in examples/src/main/python.

Author: Reynold Xin <rxin@apache.org>

Closes #870 from rxin/examples-python-pep8 and squashes the following commits:

2829e84 [Reynold Xin] Fix PEP8 violations in examples/src/main/python.

1 files changed, 2 insertions, 2 deletions

diff --git a/examples/src/main/python/logistic_regression.py b/examples/src/main/python/logistic_regression.py
index 0f22d0b323..6c33deabfd 100755
--- a/examples/src/main/python/logistic_regression.py
+++ b/examples/src/main/python/logistic_regression.py
@@ -60,8 +60,8 @@ if __name__ == "__main__":
 
     # Compute logistic regression gradient for a matrix of data points
     def gradient(matrix, w):
-        Y = matrix[:,0]    # point labels (first column of input file)
-        X = matrix[:,1:]   # point coordinates
+        Y = matrix[:, 0]    # point labels (first column of input file)
+        X = matrix[:, 1:]   # point coordinates
         # For each point (x, y), compute gradient function, then sum these up
         return ((1.0 / (1.0 + np.exp(-Y * X.dot(w))) - 1.0) * Y * X.T).sum(1)