Python基础（字典）

#创造和访问字典
'''
字典是映射类型，元组和列表是序列类型
语法：字典名={关键字：值}
'''
brand={"资产类别":"华为类别","品牌":"空","报废方式":"借","部门管理":"无"}
print("资产类别",brand["资产类别"])#资产类别 华为类别
#更换value
brand["资产类别"]="难搞"
print(brand)#{'部门管理': '无', '资产类别': '难搞', '报废方式': '借', '品牌': '空'}
brand=((("2","3"),("4",5)))#将元组作为参数
print(brand)#(('2', '3'), ('4', 5))
#字典的内嵌方法
'''
fromkeys（键值，值）
'''
zidian={}
print(zidian.fromkeys((1,2,3),"number"))#{1: 'number', 2: 'number', 3: 'number'}
print(zidian.fromkeys((1,2,3),("number","two")))#{1: ('number', 'two'), 2: ('number', 'two'), 3: ('number', 'two')}
print(zidian.fromkeys((1,2,3)))#{1: None, 2: None, 3: None}
brand={"资产类别":"华为类别","品牌":"空","报废方式":"借","部门管理":"无"}
#循环打印纸值
for eachvalue in brand.values():
    print(eachvalue)
#循环打印keys
for eachkeys in brand.keys():
    print(eachkeys)
#循环打印keys与values
for eachitem in brand.items():
    print(eachitem)
print(brand.get("他","无此项"))#无此项
'''
"他"in brand 如果这个字典中有他就会返回True，没有则返回false，
brand.clear()，清空字典，copy()浅拷贝
'''