python 3.x - KeyboardInterrupt Exception works sometimes? -

i have simple python script:

import socket import sys  try:     s = socket.socket(socket.af_inet, socket.sock_raw, socket.getprotobyname("icmp")) except socket.error msg:     print("could not open socket connection!")     print(msg)     sys.exit(1) try:     s.bind(("", 0))     print("starting listener...")     while true:         buff = s.recvfrom(65535)         print(buff[1][0]) except keyboardinterrupt:     s.close()     print("\nmanually quitting...")     sys.exit(3) except socket.error msg:     s.close()     print("socket connection failed!")     print(msg)     sys.exit(2) except:     print("something went wrong! quitting...")     sys.exit(4) s.close() 

when run script python 3.2.3, ctrl-c keyboard exception not caught time, means works sometimes. in fact error message different when trying ctrl-c program @ arbitrary moment. here output on console when script ran 3 times right after another:

$ sudo python3 listener.py  starting listener... ^ctraceback (most recent call last):   file "listener.py", line 14, in <module>     buff = s.recvfrom(65535) keyboardinterrupt  during handling of above exception, exception occurred:  traceback (most recent call last):   file "listener.py", line 17, in <module>     s.close()   file "/usr/lib/python3.2/socket.py", line 194, in close     def close(self): keyboardinterrupt   $ sudo python3 listener.py  starting listener... ^ctraceback (most recent call last):   file "listener.py", line 14, in <module>     buff = s.recvfrom(65535) keyboardinterrupt  during handling of above exception, exception occurred:  traceback (most recent call last):   file "listener.py", line 14, in <module>     buff = s.recvfrom(65535) keyboardinterrupt   $ sudo python3 listener.py  starting listener... ^c manually quitting... 

it worked last time. how come works sometimes!? doing wrong?

if examine stack trace notice there two exceptions being dealt with:

traceback (most recent call last):   file "listener.py", line 14, in <module> 

one on line 14 (in try block); , next 1 either again on line 14 or on line 17 (which in "manually quiting" block).

it looks me have hardware problem keyboard , sends 2 <ctrl-c>s instead of one.