python - RuntimeError: can't re-enter readline -

i making python 3 app has prompt user enters commands. i'm running python 3.5 on macos sierra.

i'm trying prevent exiting ctrl+c , having users exit instead typing exit prompt.

i doing using method: https://stackoverflow.com/a/6019460/7450368

however, when prompting user again, runtimeerror: can't re-enter readline.

is there way can fix this?

here's code:

import interpret import signal def siginthand(sig, frm):     print("\nuse 'exit' exit.")     prompt()  signal.signal(signal.sigint, siginthand)     version = ("v0.0.3")     class commanderror(exception):     pass     def prompt():     try:         task = input("einstein " + version + "  > ")     except runtimeerror:         task = input("einstein " + version + "  > ")     try:         execute(task)     except commanderror e:         print(e)     prompt()   def execute(command):     command = command.lower()     interpret.interpret(command)  prompt() 

interpret.interpret("command") called main.py execute command command if exists.

any hugely appreciated. thanks!

your control flow looks bit strange. handle user pressing ctrl+c more once, should use loop keep asking input.

also, can catch keyboardinterrupt in python gets raised every time hit ctrl+c. it's bit easier messing signal handlers.

version = ("v0.0.3")  class commanderror(exception):     pass  def prompt():     try:         return input("einstein " + version + "  > ")     except keyboardinterrupt:         print('') # go next line printing looks better.         return none  def force_prompt():     task = none     while task none:         task = prompt()     return task  def get_and_execute_command():     task = force_prompt()     try:         execute(task)     except commanderror e:         print(e)  def execute(command):     command = command.lower()     print('command: %s' % command)  get_and_execute_command()