fix future warning causing ci failure

Author: charlesdong1991

pandas/core/strings.py

@@ -582,8 +582,8 @@ def str_replace(arr, pat, repl, n=-1, case=None, flags=0, regex=None):
         # in pat, still take it as a literal, and raise the Future warning
         if regex is None and len(pat) == 1 and re.findall(r"\W", pat):
             warnings.warn("'%s' is interpreted as a literal in " % pat +
-                          "default, not regex. The default will change in the "
-                          "future", FutureWarning)
+                          "default, not regex. It will change in the future."
+                          , FutureWarning)
         f = lambda x: x.replace(pat, repl, n)
 
     return _na_map(f, arr)

pandas/tests/test_strings.py

@@ -2917,6 +2917,7 @@ def test_partition_deprecation(self):
             result = values.str.rpartition(pat='_')
             tm.assert_frame_equal(result, expected)
 
+    @pytest.mark.filterwarnings("ignore: '|' is interpreted as a literal")
     def test_pipe_failures(self):
         # #2119
         s = Series(['A|B|C'])
@@ -2926,7 +2927,7 @@ def test_pipe_failures(self):
 
         tm.assert_series_equal(result, exp)
 
-        result = s.str.replace('|', ' ', regex=False)
+        result = s.str.replace('|', ' ', regex=None)
         exp = Series(['A B C'])
 
         tm.assert_series_equal(result, exp)
@@ -3427,6 +3428,7 @@ def test_method_on_bytes(self):
                 ['ad', 'be', 'cf'], 'S2').astype(object))
             tm.assert_series_equal(result, expected)
 
+    @pytest.mark.filterwarnings("ignore: '.' is interpreted as a literal")
     @pytest.mark.parametrize("regex, expected_array", [
         (True, ['foofoofoo', 'foofoofoo']),
         (False, ['abc', '123']),
@@ -3439,6 +3441,7 @@ def test_replace_single_pattern(self, regex, expected_array):
         expected = Series(expected_array)
         tm.assert_series_equal(result, expected)
 
+    @pytest.mark.filterwarnings("ignore: '.' is interpreted as a literal")
     def test_replace_without_specifying_regex_parameter(self):
         values = Series(['a.c'])
         # GH: 24804