# 完成字典操作
memo = {
    '姓名': '张三',
    '电话': '13112345678',
    'QQ': '123456'}
memo['Email'] = '123456@199.com'
print(memo.get('姓名', '未知'))
print(memo.get('电话', '未知'))
print(memo.get('微信号', '未知'))
print('Email' in memo)
memo.pop('QQ')
print(memo.keys())
print(memo.values())
print(memo.items())
