Adds a missing file

src/venv_management/pyenv_config.py

@@ -0,0 +1,29 @@
+import configparser
+from pathlib import Path
+
+
+def pyvenv_config(env_dirpath: Path, key: str) -> str | None:
+    """Read a value from a pyvenv config file.
+
+    Args:
+        env_dirpath: Path to the directory containing the pyvenv.cfg file.
+        key: The key from which to lookup the associated value.
+
+    Returns:
+        The value from the pyvenv.cfg file, or None if the key does not exist
+        in the pyvenv.cfg file or if the pyenv.cfg config file does not exist.
+    """
+    pyenv_cfg_path = env_dirpath / "pyvenv.cfg"
+    value = None
+    if pyenv_cfg_path.is_file():
+        config_text = pyenv_cfg_path.read_text()
+        config = configparser.ConfigParser()
+        config.read_string("[root]\n" + config_text)
+
+        try:
+            config_executable = config["root"][key]
+        except KeyError:
+            pass
+        else:
+            value = config_executable.strip()
+    return value