小案例——搜索字典联系人key查找信息

people = {
    'Alice': {
        'phone': '2341',
        'addr': 'Foo drive 23'
    },
    'Beth': {
        'phone': '19102',
        'addr': 'Bar street 42'
    },
    'Cecil': {
        'phone': '3158',
        'addr': 'Baz avenue 90'
    }
}
labels = {
    'phone': 'phone number',
    'addr': 'address'
}
name = input('Name:')
request = input('Phone number (p) or address (a)?')
if request == 'p': key = 'phone'
if request == 'a': key = 'addr'
if name in people: print("{}'s {} is {}.".format(name, labels[key], people[name][key]))