Remove unused import that was causing a lint error

Author: jbrockmendel

pandas/core/strings.py

@@ -1912,6 +1912,8 @@ def rindex(self, sub, start=0, end=None):
                                docstring=_shared_docs['ismethods'] %
                                _shared_docs['isdecimal'])
 
+    # TODO: Should we explicitly subclass PandasDelegate to clarify its role,
+    # even though it isn't actually needed?
     # TODO: Use this instead of wrapping all of these methods individually?
     def _delegate_method(self, name, *args, **kwargs):
         # TODO: It would be really nice to keep the signatures

pandas/tests/test_strings.py

@@ -2690,8 +2690,6 @@ def test_str_cat_raises_intuitive_error(self):
             s.str.cat('    ')
 
     def test_index_str_accessor_visibility(self):
-        from pandas.core.strings import StringMethods
-
         if not compat.PY3:
             cases = [(['a', 'b'], 'string'), (['a', u('b')], 'mixed'),
                      ([u('a'), u('b')], 'unicode'),