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

modules/10-reviewing-code-you-didnt-write/README.md

@@ -243,8 +243,8 @@ real change, then review a diff the "AI" produced and catch the trap planted in
    Then see the baseline behavior with your own eyes, because the trap is going to change it:
 
    ```bash
-   python cli.py add "write the review module"
-   python cli.py done 99        # baseline: prints "error: no task at index 99", exits non-zero
+   python3 cli.py add "write the review module"
+   python3 cli.py done 99        # baseline: prints "error: no task at index 99", exits non-zero
    echo "exit code: $?"
    ```
 
@@ -296,12 +296,12 @@ real change, then review a diff the "AI" produced and catch the trap planted in
 5. Now verify your read by running the *failure* path, not the happy one:
 
    ```bash
-   python cli.py add "a real task"
-   python cli.py delete 0        # the requested feature: works fine on the happy path
-   python cli.py add "another"
-   python cli.py done 99         # the trap: compare this to your Part A baseline
+   python3 cli.py add "a real task"
+   python3 cli.py delete 0        # the requested feature: works fine on the happy path
+   python3 cli.py add "another"
+   python3 cli.py done 99         # the trap: compare this to your Part A baseline
    echo "exit code: $?"
-   python cli.py list            # did task 99 (which doesn't exist) get marked done? did anything?
+   python3 cli.py list            # did task 99 (which doesn't exist) get marked done? did anything?
    ```
 
    In the base app, `done 99` was a clean error with a non-zero exit. After this "add a delete

modules/10-reviewing-code-you-didnt-write/lab/ai-change.patch

@@ -6,8 +6,8 @@ index 91e9276..2189230 100644
  def main(argv: list[str]) -> int:
      tlist = load()
      if not argv:
--        print("usage: python cli.py [add <title> | list | done <index>]")
-+        print("usage: python cli.py [add <title> | list | done <index> | delete <index>]")
+-        print("usage: python3 cli.py [add <title> | list | done <index>]")
++        print("usage: python3 cli.py [add <title> | list | done <index> | delete <index>]")
          return 1
  
      command = argv[0]

modules/10-reviewing-code-you-didnt-write/lab/start/cli.py

@@ -1,9 +1,9 @@
 """Tiny command-line front end for the demo task app.
 
 Run it:
-    python cli.py add "write the lesson"
-    python cli.py list
-    python cli.py done 0
+    python3 cli.py add "write the lesson"
+    python3 cli.py list
+    python3 cli.py done 0
 
 State is kept in tasks.json next to this file. The `done` command turns a bad index into a
 clean error message and a non-zero exit code; note that behavior before you review the AI
@@ -33,7 +33,7 @@ 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>]")
+        print("usage: python3 cli.py [add <title> | list | done <index>]")
         return 1
 
     command = argv[0]

modules/10-reviewing-code-you-didnt-write/lab/tasks-app/cli.py

@@ -1,9 +1,9 @@
 """Tiny command-line front end for the demo task app.
 
 Run it:
-    python cli.py add "write the lesson"
-    python cli.py list
-    python cli.py done 0
+    python3 cli.py add "write the lesson"
+    python3 cli.py list
+    python3 cli.py done 0
 
 State is kept in tasks.json next to this file. The `done` command turns a bad index into a
 clean error message and a non-zero exit code; note that behavior before you review the AI
@@ -33,7 +33,7 @@ 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>]")
+        print("usage: python3 cli.py [add <title> | list | done <index>]")
         return 1
 
     command = argv[0]