Parse negative numbers from envvar Fix #799 and Fix #585

Makefile

@@ -133,6 +133,7 @@ test_examples:
 	cd example/issues/741_envvars_ignored;pwd;sh recreate.sh
 	cd example/issues/705_flask_dynaconf_init;pwd;make test;make clean
 	cd example/issues/794_includes;pwd;python app.py
+	cd example/issues/799_negative_numbers;pwd;DYNACONF_NUM="-1" python app.py
 
 test_vault:
 	# @cd example/vault;pwd;python write.py

dynaconf/utils/parse_conf.py

@@ -356,7 +356,6 @@ def parse_conf_data(data, tomlfy=False, box_settings=None):
     box_settings = box_settings or {}
 
     if isinstance(data, (tuple, list)):
-
         # recursively parse each sequence item
         return [
             parse_conf_data(item, tomlfy=tomlfy, box_settings=box_settings)
@@ -372,13 +371,6 @@ def parse_conf_data(data, tomlfy=False, box_settings=None):
             )
         return _parsed
 
-    if (
-        isinstance(data, str)
-        and data.startswith(("+", "-"))
-        and data[1:].isdigit()
-    ):
-        return data
-
     # return parsed string value
     return _parse_conf_data(data, tomlfy=tomlfy, box_settings=box_settings)
 

dynaconf/validator.py

@@ -135,6 +135,9 @@ def __init__(
         self.envs: Sequence[str] | None = None
         self.apply_default_on_none = apply_default_on_none
 
+        # See #585
+        self.is_type_of = operations.get("is_type_of")
+
         if isinstance(env, str):
             self.envs = [env]
         elif isinstance(env, (list, tuple)):
@@ -243,6 +246,20 @@ def _validate_items(
             else:
                 default_value = empty
 
+            # THIS IS A FIX FOR #585 in contrast with #799
+            # toml considers signed strings "+-1" as integers
+            # however existing users are passing strings
+            # to default on validator (see #585)
+            # The solution we added on #667 introduced a new problem
+            # This fix here makes it to work for both cases.
+            if (
+                isinstance(default_value, str)
+                and default_value.startswith(("+", "-"))
+                and self.is_type_of is str
+            ):
+                # avoid TOML from parsing "+-1" as integer
+                default_value = f"'{default_value}'"
+
             value = self.cast(
                 settings.setdefault(
                     name,

example/issues/799_negative_numbers/app.py

@@ -0,0 +1,11 @@
+from __future__ import annotations
+
+from dynaconf import Dynaconf
+
+settings = Dynaconf(settings_files=["settings.toml"])
+
+print(settings.num)
+print(type(settings.num))
+
+assert settings.num == -1, settings.num
+assert isinstance(settings.num, int)

example/issues/799_negative_numbers/settings.toml

@@ -0,0 +1 @@
+num = -1

tests/test_env_loader.py

@@ -206,6 +206,20 @@ def test_backwards_compat_using_env_argument():
     assert settings.VALUE == "BLARG as prefix"
 
 
+def test_load_signed_integer():
+    environ["799_SIGNED_NEG_INT"] = "-1"
+    environ["799_SIGNED_POS_INT"] = "+1"
+    load_from_env(
+        identifier="env_global",
+        key=None,
+        prefix="799",
+        obj=settings,
+        silent=True,
+    )
+    assert settings.SIGNED_NEG_INT == -1
+    assert settings.SIGNED_POS_INT == 1
+
+
 def test_env_is_not_str_raises():
     with pytest.raises(TypeError):
         load_from_env(settings, prefix=int)

tests/test_validators.py

@@ -739,6 +739,17 @@ def test_toml_should_not_change_validator_type_with_is_type_set():
     assert settings.test == "+172800"
 
 
+def test_toml_should_not_change_validator_type_with_is_type_not_set_int():
+    settings = Dynaconf(
+        validators=[Validator("TEST", default="+172800")]
+        # The ways to force a string is
+        # passing is_type_of=str
+        # or default="@str +172800" or default="'+172800'"
+    )
+
+    assert settings.test == +172800
+
+
 def test_toml_should_not_change_validator_type_using_at_sign():
     settings = Dynaconf(
         validators=[Validator("TEST", is_type_of=str, default="@str +172800")]