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#!/usr/bin/env python

# coding=utf-8

"""

try... except

"""

while 1:

print("this is a division program.")

c = input("input 'c' continue, otherwise logout:")

if c == 'c':

a = input("first number:")

b = 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 (ZeroDivisionError, ValueError) as e:

print(e)

#print("please input rightly.")

print("********************")

else:

break