Issue 15337: help() shown as undocumented

Lib/cmd.py

@@ -294,6 +294,7 @@ class Cmd:
         return list(commands | topics)
 
     def do_help(self, arg):
+        'List available commands with "help" or detailed help with "help cmd".'
         if arg:
             # XXX check arg syntax
             try:

Lib/test/test_cmd.py

@@ -84,11 +84,11 @@ class samplecmdclass(cmd.Cmd):
     <BLANKLINE>
     Documented commands (type help <topic>):
     ========================================
-    add
+    add  help
     <BLANKLINE>
     Undocumented commands:
     ======================
-    exit  help  shell
+    exit  shell
     <BLANKLINE>
 
     Test for the function print_topics():
@@ -125,11 +125,11 @@ class samplecmdclass(cmd.Cmd):
     <BLANKLINE>
     Documented commands (type help <topic>):
     ========================================
-    add
+    add  help
     <BLANKLINE>
     Undocumented commands:
     ======================
-    exit  help  shell
+    exit  shell
     <BLANKLINE>
     help text for add
     Hello from postloop