Minor PEP8 fixes

Author: axel-d-one

pandas/core/strings.py

@@ -37,7 +37,7 @@
 
 def _get_array_list(arr, others, align=True):
     from pandas.core.series import Series
-    
+
     if (len(arr) and isinstance(arr, Series)
             and len(others) and isinstance(others, Series)):
         if align is None:
@@ -49,7 +49,7 @@ def _get_array_list(arr, others, align=True):
                           "behavior) and silence this warning, pass "
                           "'align=True'")
         if align:
-            arr, others = arr.align(others, join = 'left')
+            arr, others = arr.align(others, join='left')
         arrays = [list(arr), list(others)]
     elif len(others) and isinstance(com._values_from_object(others)[0],
                                   (list, np.ndarray, Series)):

pandas/tests/test_strings.py

@@ -2760,18 +2760,17 @@ def test_str_cat_raises_intuitive_error(self):
             s.str.cat('|')
         with tm.assert_raises_regex(ValueError, message):
             s.str.cat('    ')
-    
+
     def test_str_cat_align(self):
         # https://github.com/pandas-dev/pandas/issues/18657
         s = Series(['a', 'b', 'c', 'd'])
-        t = Series(['a', 'b', 'c', 'd']).reindex([1,3,0,2])
+        t = Series(['a', 'b', 'c', 'd']).reindex([1, 3, 0, 2])
         expect_aligned = Series(['aa', 'bb', 'cc', 'dd'])
         expect_unaligned = Series(['ab', 'bd', 'ca', 'dc'])
         with tm.assert_produces_warning(expected_warning=UserWarning):
             tm.assert_series_equal(s.str.cat(t), expect_unaligned)
         tm.assert_series_equal(s.str.cat(t, align=False), expect_unaligned)
         tm.assert_series_equal(s.str.cat(t, align=True), expect_aligned)
-        
 
     def test_index_str_accessor_visibility(self):
         from pandas.core.strings import StringMethods