test: xfail python engine with consecutive thousand separators

Author: Alvaro-Kothe

pandas/tests/io/parser/common/test_common_basic.py

@@ -82,7 +82,7 @@ def test_read_csv_local(all_parsers, csv1):
         ("2,,3,4,,,,,,,,,,,,5", 2345),
     ],
 )
-def test_1000_sep(all_parsers, number_csv, expected_number):
+def test_1000_sep(all_parsers, number_csv, expected_number, request):
     parser = all_parsers
     data = f"""A|B|C
 1|{number_csv}|5
@@ -95,6 +95,11 @@ def test_1000_sep(all_parsers, number_csv, expected_number):
         with pytest.raises(ValueError, match=msg):
             parser.read_csv(StringIO(data), sep="|", thousands=",")
         return
+    elif parser.engine == "python" and ",," in number_csv:
+        mark = pytest.mark.xfail(
+            reason="Python engine doesn't allow consecutive thousands separators"
+        )
+        request.applymarker(mark)
 
     result = parser.read_csv(StringIO(data), sep="|", thousands=",")
     tm.assert_frame_equal(result, expected)