字典相關函式 集合相關的操作 交差並補

dic ={}

dic[
"top
"] = "廉頗"
dic[
"middle
"] = "妲己"
dic[
"bottom
"] = "
孫尚香"
print(dic)

1.fromkeys()  使用一組鍵和預設值建立字典 (快速定義字典)

lst = ["

a","
b",'c'
]#fromkeys(塞滿鍵的容器,預設值)
dic ={}.fromkeys(lst,none)
print(dic) #

1.pop()       通過鍵去刪除鍵值對 (若沒有該鍵可設定預設值,預防報錯)

dic = 

#指定鍵刪除對應的鍵值對
res = dic.pop("
jungle")
#若沒有該鍵可設定預設值,預防報錯
res = dic.pop("
middle123434
","抱歉,該鍵不存在")
print
(res)
print(dic)

2.popitem()   刪除最後乙個鍵值對 

dic = 

res =dic.popitem()
print
(res)
print(dic)

3.clear()  清空字典

dic.clear()

print(dic)

update() 批量更新(有該鍵就更新,沒該鍵就新增)

dic =  

#沒該鍵就新增
dic_new = 
dic.update(dic_new)
print
(dic)
#有該鍵就更新
dic_new = 
dic.update(dic_new)
print
(dic)
#額外的用法(了解)
dic.update(middle="
甄姬",jungle="劉備"
)print(dic)

get()    通過鍵獲取值(若沒有該鍵可設定預設值,預防報錯)

dic =  

res = dic.get("
top123")
res = dic.get("
top123
","抱歉,改鍵不存在")
#res = dic["top"]
print(res)

#

keys() 將字典的鍵組成新的可迭代物件
dic = 
res =dic.keys()
print
(res , type(res))
#values() 將字典中的值組成新的可迭代物件
res =dic.values()
print
(res , type(res))
#items() 將字典的鍵值對湊成乙個個元組,組成新的可迭代物件 
res =dic.items()
print
(res , type(res))
"""dict_items(
[ ('top', '廉頗'), 
('middle', '妲己'), 
('bottom', '孫尚香')]
) """
for k,v in
dic.items():
print(k,v)

set1 =

set2 =

res =set1.intersection(set2)

print
(res)
#簡寫 
res = set1 &set2
print(res)

res =set1.difference(set2)

print
(res)
#簡寫 
res = set1 -set2
print(res)

res =set1.union(set2)

print
(res)
#簡寫 
res = set1 |set2
print(res)

res =set1.symmetric_difference(set2)

print
(res)
#簡寫 
res = set1 ^set2
print(res)

set1 =

set2 =

res =set2.issubset(set1)

print(res)

res = set2 < set1

print(res)

res =set1.issuperset(set2)

print
(res)#簡寫
res = set1 >set2
print(res)

set1 = 

set2 = 
res =set1.isdisjoint(set2)
print(res)

setvar = 

#1.一次加乙個
#add() 向集合中新增資料
setvar.add("
周星馳"
)setvar.add(
"周樹人")
print
(setvar)
#2.一次加一堆
#update() 迭代著增加
setvar = 
lst = ["
馬蓉","
馬化騰","
馬戶","
馬雲","碼農"
]lst = "
abc"
setvar.update(lst)
print(setvar)

setvar =

1clear()   清空集合

#

setvar.clear()
#print(setvar)

2. pop()     隨機刪除集合中的乙個資料

#

res = setvar.pop()
#print(res)
#print(setvar)

3. discard() 刪除集合中指定的值(不存在的不刪除 推薦使用)

setvar.discard("

郭傑瑞"
)setvar.discard(
"郭傑瑞11122333")
print(setvar)

"""

冰凍集合一旦建立,不能在進行任何修改,只能做交叉並補操作
"""#
frozenset 可強轉容器型別資料變為冰凍集合
lst = ["
馬蓉","
馬化騰","
馬戶","
馬雲","碼農"
]fz =frozenset(lst)
print
(fz,type(fz))
fz1 = frozenset( ) 
fz2 = frozenset( )
#只能做交叉並補操作
res = fz1 &fz2
print
(res)
#可以做新增操作麼? 不可以
fz1.add("
abc")

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