pep8 fixes

Author: mroeschke

pandas/core/generic.py

@@ -3635,15 +3635,17 @@ def replace(self, to_replace=None, value=None, inplace=False, limit=None,
               require that you also specify an `order` (int),
               e.g. df.interpolate(method='polynomial', order=4).
               These use the actual numerical values of the index.
-            * 'krogh', 'piecewise_polynomial', 'spline', 'pchip' and 'akima' are all
-              wrappers around the scipy interpolation methods of similar
-              names. These use the actual numerical values of the index. For
-              more information on their behavior, see the `scipy documentation
+            * 'krogh', 'piecewise_polynomial', 'spline', 'pchip' and 'akima'
+              are all wrappers around the scipy interpolation methods of
+              similar names. These use the actual numerical values of the
+              index. For more information on their behavior, see the
+              `scipy documentation
               <http://docs.scipy.org/doc/scipy/reference/interpolate.html#univariate-interpolation>`__
               and `tutorial documentation
               <http://docs.scipy.org/doc/scipy/reference/tutorial/interpolate.html>`__
             * 'from_derivatives' refers to BPoly.from_derivatives which
-              replaces 'piecewise_polynomial' interpolation method in scipy 0.18
+              replaces 'piecewise_polynomial' interpolation method in
+              scipy 0.18
 
             .. versionadded:: 0.18.1
 

pandas/tools/plotting.py

@@ -2893,7 +2893,8 @@ def hist_frame(data, column=None, by=None, grid=True, xlabelsize=None,
         invisible
     figsize : tuple
         The size of the figure to create in inches by default
-    layout : (optional) a tuple (rows, columns) for the layout of the histograms
+    layout : tuple, optional
+        Tuple of (rows, columns) for the layout of the histograms
     bins : integer, default 10
         Number of histogram bins to be used
     kwds : other plotting keyword arguments