Use python3 as the canonical command name course-wide (#104) (#105)

modules/14-continuous-integration/lab/start/README.md

@@ -15,11 +15,11 @@ This is the running example for **Module 1** (where you feel the copy-paste prob
 ## Run it
 
 ```bash
-python cli.py add "read module 1"
-python cli.py add "set up my editor"
-python cli.py list
-python cli.py done 0
-python cli.py list
+python3 cli.py add "read module 1"
+python3 cli.py add "set up my editor"
+python3 cli.py list
+python3 cli.py done 0
+python3 cli.py list
 ```
 
 Requires Python 3.10+ (it uses `list[Task]` style type hints). No third-party packages.

modules/14-continuous-integration/lab/start/cli.py

@@ -1,8 +1,8 @@
 """Tiny command-line front end for the demo task app.
 
 Run it:
-    python cli.py add "write the lesson"
-    python cli.py list
+    python3 cli.py add "write the lesson"
+    python3 cli.py list
 
 State is kept in tasks.json next to this file. It's intentionally minimal; the point of this app
 is to be a realistic-but-small thing you change with an AI, not a product.
@@ -31,7 +31,7 @@ def save(tlist: TaskList) -> None:
 def main(argv: list[str]) -> int:
     tlist = load()
     if not argv:
-        print("usage: python cli.py [add <title> | list | done <index> | count | delete <index>]")
+        print("usage: python3 cli.py [add <title> | list | done <index> | count | delete <index>]")
         return 1
 
     command = argv[0]

modules/14-continuous-integration/lab/test_tasks.py

@@ -2,7 +2,7 @@
 
 Reproduced here so this module's lab is self-contained: if you already wrote tests in Module 13,
 use those instead. Standard-library `unittest`, exactly like Module 13, nothing to install.
-Run locally with `python -m unittest` from the project folder. CI runs exactly this.
+Run locally with `python3 -m unittest` from the project folder. CI runs exactly this.
 """
 
 import unittest