#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Example to show how module cmd is use. Example taken from: https://docs.python.org/3.4/library/cmd.html You might need to install the python module: sudo apt-get install python3-tk See more on turtle: https://docs.python.org/3.4/library/turtle.html """ # pylint: disable=locally-disabled,unused-argument,too-many-public-methods import cmd #import sys import turtle class TurtleShell(cmd.Cmd): """ Example of class with command actions. """ intro = 'Welcome to the turtle shell. Type help or ? to list commands.\n' prompt = '(turtle) ' file = None # ----- basic turtle commands ----- def do_forward(self, arg): 'Move the turtle forward by the specified distance: FORWARD 10' turtle.forward(*parse(arg)) def do_right(self, arg): 'Turn turtle right by given number of degrees: RIGHT 20' turtle.right(*parse(arg)) def do_left(self, arg): 'Turn turtle left by given number of degrees: LEFT 90' turtle.left(*parse(arg)) def do_goto(self, arg): 'Move turtle to an absolute position with changing orientation. GOTO 100 200' turtle.goto(*parse(arg)) def do_home(self, arg): 'Return turtle to the home postion: HOME' turtle.home() def do_circle(self, arg): 'Draw circle with given radius an options extent and steps: CIRCLE 50' turtle.circle(*parse(arg)) def do_position(self, arg): 'Print the current turle position: POSITION' print('Current position is %d %d\n' % turtle.position()) def do_heading(self, arg): 'Print the current turle heading in degrees: HEADING' print('Current heading is %d\n' % (turtle.heading(),)) def do_color(self, arg): 'Set the color: COLOR BLUE' turtle.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' turtle.reset() def do_bye(self, arg): 'Stop recording, close the turtle window, and exit: BYE' print('Thank you for using Turtle') self.close() turtle.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): 'Close the file.' if self.file: self.file.close() self.file = None def parse(arg): 'Convert a series of zero or more numbers to an argument tuple' return tuple(map(int, arg.split())) if __name__ == '__main__': print(__doc__) TurtleShell().cmdloop()