函数1：字典.items()

#dict_items：元组
#字典.item()：字典元组化
aaa = {'Google': 'www.google.com', 'Runoob': 'www.runoob.com', 'taobao': 'www.taobao.com'}
print('字典元组化{}'.format(aaa.items()))
# 结果：字典元组化dict_items([('Google', 'www.google.com'), ('Runoob', 'www.runoob.com'), ('taobao', 'www.taobao.com')])
a = aaa.items()
print(type(a))
# 结果：<class 'dict_items'>
for i in a:
    print(i[0])
# 结果：Google Runoob taobao