#字典的KEY只能是不可變數據類型：（int bool 字符串 元祖） （可變數據類型：list dict set）
# dic = {1: 1, ‘age‘: 18, ‘name‘: ‘huang‘, (1, 2): ‘abc‘}
# print(dic)

#增
# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘,}
# dic[‘sex‘] = ‘male‘            #沒有KEY，添加
# dic[‘age‘] = 16                #如果有key，則值覆蓋
# print(dic)

# dic.setdefault(‘weight‘)            #沒有KEY，添加,默認是None
 

# dic.setdefault(‘weight‘, 50)        #已經有KEY就不改變
# print(dic)


#刪
# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘}
# print(dic.pop(‘name‘))             #刪除KEY時返回的是value,如果KEY不存在則出錯
# print(dic.pop(‘age‘, None))        #刪除KEY時返回的是value,如果KEY不存在則返回None而不會出錯
# print(dic)

# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘}
 

# del dic
# print(dic)

# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘}
# print(dic.clear())                  #清空


#改
# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘}
# dic[‘age‘] = 33              #直接改已存在的KEY值
# print(dic)

# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘}
# dic2 = {‘name‘: ‘haisheng‘, ‘sex‘: ‘male‘, ‘birth‘: 1992}
 

# dic.update(dic2)                  #如果KEY相同則更新value，否則更新所有新的鍵值對
# print(dic)


#查
# dic = {‘name‘: ‘huang‘, ‘age‘: 26, ‘work‘: ‘IT‘}
# print(dic.keys())               #打印KEY,返回列表[‘name‘, ‘age‘, ‘work‘]
# print(dic.values())             #打印字典的值[‘huang‘, 26, ‘IT‘]
# print(dic.items())              #打印字典的項[(‘name‘, ‘huang‘), (‘age‘, 26), (‘work‘, ‘IT‘)]

# for k in dic:                  # 相當於 for k in dic.keys():
#     print(k)
#
# for v in dic.values():         #返回value
#     print(v)
#
# for i in dic.items():          #返回的是元祖 (‘name‘, ‘huang‘)
#     print(i)

# for k, v in dic.items():         #返回的是鍵值對應關系
#     print(k, v)

# v = dic[‘age‘]                 #查字典的KEY對應的值，如果沒有KEY則報錯
# print(v)
#
# v = dic.get(‘age1‘, None)       #查字典的KEY對應的值，如果沒有KEY則不報錯，返回None
# print(v)

#a, b = 1, 2
#a, b =b, a              a和b互換

字典的方法