ch01: add positional argument and help doc

JBSP-code · JBSP-code · commit ff354b40b978 · 2023-01-02T11:37:15.000+01:00
diff --git a/01_hello/hello.py b/01_hello/hello.py
@@ -1,3 +1,9 @@
 #!/usr/bin/env python3
 # Purpose: Say hello
-print("Hello, World!")
+
+import argparse
+
+parser = argparse.ArgumentParser(description="Say hello")
+parser.add_argument("name", help="Name to greet")
+args = parser.parse_args()
+print("Hello, " + args.name + "!")
