pep8 error

Author: charlesdong1991

pandas/core/strings.py

@@ -583,7 +583,7 @@ def str_replace(arr, pat, repl, n=-1, case=None, flags=0, regex=None):
                              "regex=False")
         # if regex is default None, and a single special character is given
         # in pat, still take it as a literal, and raise the Future warning
-        if regex is None and len(pat) == 1 and pat in list("[\^$.|?*+()]"):
+        if regex is None and len(pat) == 1 and pat in list(r"[\^$.|?*+()]"):
             warnings.warn("'{}' is interpreted as a literal in ".format(pat) +
                           "default, not regex. It will change in the future.",
                           FutureWarning)

pandas/tests/test_strings.py

@@ -3441,8 +3441,9 @@ def test_replace_single_pattern(self, regex, expected_array):
         expected = Series(expected_array)
         tm.assert_series_equal(result, expected)
 
-    @pytest.mark.parametrize("input_array, single_char, replace_char,"
-                             "expect_array, warn", [
+    @pytest.mark.parametrize("input_array, single_char, replace_char, "
+                             "expect_array, warn",
+                             [
                                 ("a.c", ".", "b", "abc", True),
                                 ("a@c", "@", "at", "aatc", False)
                                 ])