21702.py

#!/usr/bin/env python
# coding=utf-8

"""
try... except
"""

while 1:
    print "this is a division program."
    c = raw_input("input 'c' continue, otherwise logout:")
    if c == 'c':
        a = raw_input("first number:")
        b = raw_input("second number:")
        try:
            print float(a)/float(b)
            print "*************************"
        #except ZeroDivisionError:
        #    print "The second number can't be zero!"
        #    print "*************************"
        #except ValueError:
        #    print "please input number."
        #    print "************************"
        except:
            print "some wrong..."
            print "********************"
    else:
        break