removed \ delimiter

Author: anmyachev

pandas/_libs/tslibs/parsing.pyx

@@ -50,7 +50,7 @@ cdef:
 
 # ----------------------------------------------------------------------
 cdef:
-    const char* delimiters = " /-\\."
+    const char* delimiters = " /-."
     int MAX_DAYS_IN_MONTH = 31, MAX_MONTH = 12
 
 
@@ -84,8 +84,8 @@ cdef inline object _parse_delimited_date(object date_string, bint dayfirst):
 
     Note
     ----
-    For MM/DD/YYYY, DD/MM/YYYY: delimiter can be a space or one of ./-\\
-    For MM/YYYY: delimiter can be a space or one of /-\\
+    For MM/DD/YYYY, DD/MM/YYYY: delimiter can be a space or one of /-.
+    For MM/YYYY: delimiter can be a space or one of /-
     If `date_string` can't be converted to date, then function returns
     None, None
 

pandas/tests/io/parser/test_parse_dates.py

@@ -881,13 +881,13 @@ def test_invalid_parse_delimited_date(all_parsers, date_string):
 
 @pytest.mark.parametrize("date_string,dayfirst,expected", [
     # %d/%m/%Y; month > 12 thus replacement
-    ("13\\02\\2019", False, datetime(2019, 2, 13)),
-    ("13\\02\\2019", True, datetime(2019, 2, 13)),
+    ("13/02/2019", False, datetime(2019, 2, 13)),
+    ("13/02/2019", True, datetime(2019, 2, 13)),
     # %m/%d/%Y; day > 12 thus there will be no replacement
-    ("02\\13\\2019", False, datetime(2019, 2, 13)),
-    ("02\\13\\2019", True, datetime(2019, 2, 13)),
+    ("02/13/2019", False, datetime(2019, 2, 13)),
+    ("02/13/2019", True, datetime(2019, 2, 13)),
     # %d/%m/%Y; dayfirst==True thus replacement
-    ("04\\02\\2019", True, datetime(2019, 2, 4))
+    ("04/02/2019", True, datetime(2019, 2, 4))
 ])
 def test_parse_delimited_date_swap(all_parsers, date_string,
                                    dayfirst, expected):