Support underscore as first char in env file variable names (#263)

Author: willkg

HISTORY.rst

@@ -1,16 +1,31 @@
 History
 =======
 
+3.4.0 (in development)
+----------------------
+
+Backwards incompatible changes:
+
+* Drop support for Python 3.8. Thanks, Rob!
+
+Fixes and features:
+
+* Add support for Python 3.13. (#260) Thanks, Rob!
+
+* Add support for underscore as first character in variable names in env files.
+  (#263)
+
+
 3.3.0 (November 6th, 2023)
 --------------------------
 
 Backwards incompatible changes:
 
-* Dropped support for Python 3.7. (#220)
+* Drop support for Python 3.7. (#220)
 
 Fixes and features:
 
-* Added support for Python 3.12 (#221)
+* Add support for Python 3.12 (#221)
 
 * Fix env file parsing in regards to quotes. (#230)
 

src/everett/manager.py

@@ -55,7 +55,7 @@
 
 
 # Regex for valid keys in an env file
-ENV_KEY_RE = re.compile(r"^[a-z][a-z0-9_]*$", flags=re.IGNORECASE)
+ENV_KEY_RE = re.compile(r"^[a-z_][a-z0-9_]*$", flags=re.IGNORECASE)
 
 logger = logging.getLogger("everett")
 

tests/data/.env

@@ -3,4 +3,8 @@ LOGLEVEL=walter
 DEBUG=True
 YOURE_NOT_A=golfer
 
+# env var with quotes around value
 DATABASE_URL="sqlite:///kahlua.db"
+
+# env var that starts with underscore
+_TYPER_STANDARD_TRACEBACK=1

tests/test_manager.py

@@ -372,12 +372,14 @@ def test_ConfigEnvFileEnv(datadir):
     assert cefe.get("not_a", namespace="youre") == "golfer"
     assert cefe.get("loglevel") == "walter"
     assert cefe.get("LOGLEVEL") == "walter"
+    assert cefe.get("_typer_standard_traceback") == "1"
     assert cefe.get("missing") is NO_VALUE
     assert cefe.data == {
         "LOGLEVEL": "walter",
         "DEBUG": "True",
         "YOURE_NOT_A": "golfer",
         "DATABASE_URL": "sqlite:///kahlua.db",
+        "_TYPER_STANDARD_TRACEBACK": "1",
     }
 
     cefe = ConfigEnvFileEnv(env_filename)