Fix timedelta parsing breaking change

src/environs/__init__.py

@@ -378,17 +378,18 @@ class TimeDeltaField(ma.fields.TimeDelta):
     def _deserialize(self, value, *args, **kwargs) -> timedelta:
         if isinstance(value, timedelta):
             return value
-        match = _TIMEDELTA_PATTERN.match(value)
-        if match is not None and match.group(0):  # disallow "", allow "0s"
-            return timedelta(
-                weeks=int(match.group(1) or 0),
-                days=int(match.group(2) or 0),
-                hours=int(match.group(3) or 0),
-                minutes=int(match.group(4) or 0),
-                seconds=int(match.group(5) or 0),
-                milliseconds=int(match.group(6) or 0),
-                microseconds=int(match.group(7) or 0),
-            )
+        if isinstance(value, str):
+            match = _TIMEDELTA_PATTERN.match(value)
+            if match is not None and any(groups := match.groups(default=0)):
+                return timedelta(
+                    weeks=int(groups[0]),
+                    days=int(groups[1]),
+                    hours=int(groups[2]),
+                    minutes=int(groups[3]),
+                    seconds=int(groups[4]),
+                    milliseconds=int(groups[5]),
+                    microseconds=int(groups[6]),
+                )
         return super()._deserialize(value, *args, **kwargs)
 
 

tests/test_environs.py

@@ -229,6 +229,13 @@ def test_date_cast(self, set_env, env):
         assert env.date("DATE") == date
 
     def test_timedelta_cast(self, set_env, env):
+        # default values
+        assert env.timedelta("TIMEDELTA", "42") == dt.timedelta(seconds=42)
+        assert env.timedelta("TIMEDELTA", 42) == dt.timedelta(seconds=42)
+        assert env.timedelta("TIMEDELTA", 42.9) == dt.timedelta(seconds=42)  # bug?
+        assert env.timedelta("TIMEDELTA", dt.timedelta(seconds=42)) == dt.timedelta(
+            seconds=42,
+        )
         # seconds as integer
         set_env({"TIMEDELTA": "0"})
         assert env.timedelta("TIMEDELTA") == dt.timedelta()
@@ -244,7 +251,7 @@ def test_timedelta_cast(self, set_env, env):
         set_env({"TIMEDELTA": "-42s"})
         assert env.timedelta("TIMEDELTA") == dt.timedelta(seconds=-42)
         # whitespaces, units subselection (but descending ordering)
-        set_env({"TIMEDELTA": " 42 d  -42s "})
+        set_env({"TIMEDELTA": " 42 d \t -42s "})
         assert env.timedelta("TIMEDELTA") == dt.timedelta(days=42, seconds=-42)
         # unicode µs (in addition to us below)
         set_env({"TIMEDELTA": "42µs"})
@@ -262,6 +269,10 @@ def test_timedelta_cast(self, set_env, env):
         )
         # empty string not allowed
         set_env({"TIMEDELTA": ""})
+        with pytest.raises(environs.EnvError):
+            env.timedelta("TIMEDELTA")
+        # empty string with whitespace not allowed
+        set_env({"TIMEDELTA": " "})
         with pytest.raises(environs.EnvError):
             env.timedelta("TIMEDELTA")
         # float not allowed