Update Makefile

Author: rlan

Makefile

@@ -9,15 +9,15 @@
 default: install lint test
 
 install:
-	uv sync --all-extras --group lint
+	uv sync --locked --group lint
 
 lint:
-	-codespell ./src
-	-ruff check ./src
-	-ruff format ./src
+	-uv run codespell ./src
+	-uv run ruff check ./src
+	-uv run ruff format ./src
 
 test:
-	-schwab2pp example.csv test.csv
+	-uv run schwab2pp example.csv test.csv
 	-diff example_out.csv test.csv
 
 upgrade:

development.md

@@ -30,3 +30,11 @@ make clean
 # Upgrade dependencies to compatible versions:
 make upgrade
 ```
+
+To test with a specific version of Python, use the [`UV_PYTHON`](https://docs.astral.sh/uv/configuration/environment/#uv_python) environment variable. For example,
+
+```sh
+UV_PYTHON=3.8 make
+```
+
+will install and use Python 3.8.