输入名字显示其生日，没有则让输入生日，做记录

birthdays = {'Alice': 'Apr 1', 'Bob': 'Dec 12', 'Carol': 'Mar 4'}
while True:
    print('Enter a name: (blank to quit)')
    name = input()
    if name == '':
        break
    if name in birthdays:
        print(birthdays[name] + ' is the birthday of ' + name)
    else:
        print('I do not have birthday information for ' + name)
        print('What is their birthday?')
        bday = input()
        birthdays[name] = bday
        print('Birthday database updated.')
'''        
Enter a name: (blank to quit)
Alice
Apr 1 is the birthday of Alice
Enter a name: (blank to quit)
xiaoming
I do not have birthday information for xiaoming
What is their birthday?
10.1
Birthday database updated.
Enter a name: (blank to quit)
xiaoming
10.1 is the birthday of xiaoming
Enter a name: (blank to quit)
不输入
退出程序
'''