Python Cmd: How to edit the last command

Question

I am working on a small command line application based on the Cmd Python module. I can't see how to show the last command in the console prompt so that it can be edited by the user and re-submitted.

The question is not about how to store the last command. It is about how to shows it in the prompt and allow the user to edit it

The `cmd` module does not support something like this. You will have to build your own console interpreter for this, or use something like ncurses. — poke, Jul 01 '15 at 06:33
why is everyone voting this question down so much, I think it's an OK question? — maxymoo, Jul 01 '15 at 06:57

score 1 · Answer 1 · answered Jul 01 '15 at 06:37

From the docs for cmd, Cmd has a parameter:

Cmd.use_rawinput A flag, defaulting to true. If true, cmdloop() uses raw_input() to display a prompt and read the next command; if false, sys.stdout.write() and sys.stdin.readline() are used. (This means that by importing readline, on systems that support it, the interpreter will automatically support Emacs-like line editing and command-history keystrokes.)

I.e., you can use the up arrow to bring up the last command:

>>> import cmd
>>> C = cmd.Cmd()
>>> C.cmdloop()
(Cmd) command1
*** Unknown syntax: command1
(Cmd) command1

In the final line above, I pressed the up arrow and it remembered my last command.

score 0 · Answer 2 · answered Jul 01 '15 at 06:34

0

Just use readline library. You can find example in python doc: https://docs.python.org/3/library/readline.html

answered Jul 01 '15 at 06:34

Eriks Dobelis

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Python Cmd: How to edit the last command

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