why KeyboardInterrupt is not working in python?

Question

Why code like that is not catching CTRL-C?

MaxVal = 10000
StepInterval = 10

for i in range(1,MaxVal,StepInterval):
    try:
        print str(i)
    except KeyboardInterrupt:
        break

print "done"

My expectation is -- if CTRL-C is pressed while program is running, KeyboardInterrupt is supposed to leave the loop. It does not.

Any help on what I'm doing wrong?

Answer 1

It does break out of the loop and print "done".

Answer 2

It works.

I'm using Ubuntu Linux, and you? Test it again using something like MaxVal = 10000000

Answer 3

Sounds like the program is done by the time control-c has been hit, but your operating system hasn't finished showing you all the output. .

Answer 4

code flow is as follows:

1. for grabs new object from list (generated by range) and sets i to it
2. try
3. print
4. go back to 1

If you hit CTRL-C in the part 1 it is outside the try/except, so it won't catch the exception.

Try this instead:

MaxVal = 10000
StepInterval = 10

try:
    for i in range(1, MaxVal, StepInterval):
        print i
except KeyboardInterrupt:
    pass

print "done"