GH9570 allow timedelta string conversion without leading zero

Author: chrisgilmerproj

pandas/tseries/tests/test_timedeltas.py

@@ -64,6 +64,11 @@ def test_construction(self):
         self.assertEqual(Timedelta(123072001000000).value, 123072001000000)
         self.assertTrue('1 days 10:11:12.001' in str(Timedelta(123072001000000)))
 
+        # string conversion with/without leading zero
+        # GH 9570
+        self.assertEqual(Timedelta('0:00:00'), timedelta(hours=0))
+        self.assertEqual(Timedelta('00:00:00'), timedelta(hours=0))
+
         # more strings
         # GH 8190
         self.assertEqual(Timedelta('1 h'), timedelta(hours=1))

pandas/tseries/timedeltas.py

@@ -119,7 +119,7 @@ def _validate_timedelta_unit(arg):
 _short_search = re.compile(
     "^\s*(?P<neg>-?)\s*(?P<value>\d*\.?\d*)\s*(?P<unit>d|s|ms|us|ns)?\s*$",re.IGNORECASE)
 _full_search = re.compile(
-    "^\s*(?P<neg>-?)\s*(?P<days>\d*\.?\d*)?\s*(days|d|day)?,?\s*\+?(?P<time>\d{2}:\d{2}:\d{2})?(?P<frac>\.\d+)?\s*$",re.IGNORECASE)
+    "^\s*(?P<neg>-?)\s*(?P<days>\d*\.?\d*)?\s*(days|d|day)?,?\s*\+?(?P<time>\d{1,2}:\d{2}:\d{2})?(?P<frac>\.\d+)?\s*$",re.IGNORECASE)
 _nat_search = re.compile(
     "^\s*(nat|nan)\s*$",re.IGNORECASE)
 _whitespace = re.compile('^\s*$')