phython(异常)

s=raw_input("Input your age:")

if s =="":

    raise Exception("Input must no be empty.")

 

try:

    i=int(s)

except ValueError:

    print "Could not convert data to an integer."

except:

    print "Unknown exception!"

else: # It is useful for code that must be executed if the try clause does not raise an exception

    print "You are %d" % i," years old"

finally: # Clean up action

    print "Goodbye!"