Can I make use of an interrupt to print a status while still continue process?

问题

In python, is it possible to make use of KeyboardInterrupt or CTRL+C to print a status message, possibly like printing content of a variable and then continuing with the execution? Or will Interrupts always kill the process?

An example of what I would like to do:

def signal_handler(signum, frame):
    global interrupted
    interrupted = True

while true:
   update(V)
   if interrupted:
      print V

回答1:

You can do this using a signal handler:

import signal

def sigint_handler(signum, frame):
     print "my_variable =", frame.f_locals.get("my_variable", None)

signal.signal(signal.SIGINT, sigint_handler)

Now interrupting the script calls the handler, which prints the variable, fishing it out of the current stack frame. The script then continues.

回答2:

It can be done. The signal library provides this functionality, and it pretty much goes the way you prototyped.

import signal

interrupted = False

def signal_handler(signum, frame):
    global interrupted
    interrupted = True

signal.signal(signal.SIGINT, signal_handler)

while true:
    update(V)
    if interrupted:
        print V

回答3:

Pressing ctrl+c raises KeyboardInterrupt.

Catch KeyboardInterrupt and print a message from it, or use a state variable like you have above.

See: Capture Control-C in Python

来源：https://stackoverflow.com/questions/18973238/can-i-make-use-of-an-interrupt-to-print-a-status-while-still-continue-process