Question

我正在使用Python的cmd模块为应用程序创建自定义交互式提示。现在，当我在提示符下键入help时，它会自动显示我的自定义命令列表，例如

[myPromt] help

Documented commands (type help <topic>):
========================================
cmd1 cmd2 cmd3

我想用一些文字来解释这一点，这些文字解释了可以在提示符处使用的键盘快捷键，例如

[myPromt] help

Documented commands (type help <topic>):
========================================
cmd1 cmd2 cmd3

(use Ctrl+l to clear screen, Ctrl+a to move cursor to line start, Ctrl+e to move cursor to line end)

有没有人知道一种工具输入的方法并修改在发出帮助命令时打印的样板文本？

Answer 1

如何使用doc_header attribute：

import cmd

class MyCmd(cmd.Cmd):
    def do_cmd1(self): pass
    def do_cmd2(self): pass
    def do_cmd3(self): pass

d = MyCmd()
d.doc_header = '(use Ctrl+l to clear screen, Ctrl+a ...)'  # <---
d.cmdloop()

示例输出：

(Cmd) ?

(use Ctrl+l to clear screen, Ctrl+a ...)
========================================
help

Undocumented commands:
======================
cmd1  cmd2  cmd3

如果您需要在正常的帮助消息之后放置自定义消息，请使用do_help：

import cmd

class MyCmd(cmd.Cmd):
    def do_cmd1(self): pass
    def do_cmd2(self): pass
    def do_cmd3(self): pass
    def do_help(self, *args):
        cmd.Cmd.do_help(self, *args)
        print 'use Ctrl+l to clear screen, Ctrl+a ...)'

d = MyCmd()
d.cmdloop()

输出：

(Cmd) ?

Undocumented commands:
======================
cmd1  cmd2  cmd3  help

use Ctrl+l to clear screen, Ctrl+a ...)

扩充Python cmd模块＆＃34;帮助＆＃34;打印

1 个答案: