我正在尝试创建一个命令行,允许用户执行各种功能。例如,如果我在终端中输入“scriptrun”,我希望它能从另一个.py文件中运行一个函数,然后返回到终端(->>)。但是,出现了一些问题:如果我输入“scriptrun”,它会正常运行,但是如果我再次按下“enter”键,它会再次运行该命令。我是基于找到的一个Turtle CLI进行构建的。当我输入help时,我想要它只显示帮助主题列表一次,然后如果我不断按下enter键,它将只显示终端,但以下情况正在发生!:
(Terminal) help 已记录的命令(输入help):
bye color goto help left position reset scriptrun circle forward heading home playback record right undo
(Terminal) [这里我只是按了enter键,但下面你可以看到它再次调用了help函数!]
已记录的命令(输入help):
bye color goto help left position reset scriptrun circle forward heading home playback record right undo
(Terminal)
下面是我尝试解决方案的示例代码:
非常感谢您提供帮助和建议!如果有解决方案,请不吝赐教!谢谢! :)
(Terminal) help 已记录的命令(输入help):
bye color goto help left position reset scriptrun circle forward heading home playback record right undo
(Terminal) [这里我只是按了enter键,但下面你可以看到它再次调用了help函数!]
已记录的命令(输入help):
bye color goto help left position reset scriptrun circle forward heading home playback record right undo
(Terminal)
下面是我尝试解决方案的示例代码:
import cmd, sys
from turtle import *
from orion_package import *
class TurtleShell(cmd.Cmd):
intro = 'Welcome to the turtle shell. Type help or ? to list commands.\n'
prompt = '(Terminal) '
file = None
# ----- basic turtle commands -----
def do_forward(self, arg):
'Move the turtle forward by the specified distance: FORWARD 10'
forward(*parse(arg))
def do_right(self, arg):
'Turn turtle right by given number of degrees: RIGHT 20'
right(*parse(arg))
def do_left(self, arg):
'Turn turtle left by given number of degrees: LEFT 90'
left(*parse(arg))
def do_goto(self, arg):
'Move turtle to an absolute position with changing orientation. GOTO 100 200'
goto(*parse(arg))
def do_home(self, arg):
'Return turtle to the home postion: HOME'
home()
def do_circle(self, arg):
'Draw circle with given radius an options extent and steps: CIRCLE 50'
circle(*parse(arg))
def do_position(self, arg):
'Print the current turle position: POSITION'
print('Current position is %d %d\n' % position())
def do_heading(self, arg):
'Print the current turle heading in degrees: HEADING'
print('Current heading is %d\n' % (heading(),))
def do_color(self, arg):
'Set the color: COLOR BLUE'
color(arg.lower())
def do_undo(self, arg):
'Undo (repeatedly) the last turtle action(s): UNDO'
def do_reset(self, arg):
'Clear the screen and return turtle to center: RESET'
reset()
def do_bye(self, arg):
'Stop recording, close the turtle window, and exit: BYE'
print('Thank you for using Turtle')
self.close()
bye()
return True
# ----- record and playback -----
def do_record(self, arg):
'Save future commands to filename: RECORD rose.cmd'
self.file = open(arg, 'w')
def do_playback(self, arg):
'Playback commands from a file: PLAYBACK rose.cmd'
self.close()
with open(arg) as f:
self.cmdqueue.extend(f.read().splitlines())
def precmd(self, line):
line = line.lower()
if self.file and 'playback' not in line:
print(line, file=self.file)
return line
def close(self):
if self.file:
self.file.close()
self.file = None
def do_scriptrun(self, arg):
'Run the script: SCRIPTRUN'
print("Let's run this thing! :)")
scriptrun()
def parse(arg):
'Convert a series of zero or more numbers to an argument tuple'
return tuple(map(int, arg.split()))
if __name__ == '__main__':
TurtleShell().cmdloop()
非常感谢您提供帮助和建议!如果有解决方案,请不吝赐教!谢谢! :)