用書 PYTHON王者歸來 作者洪錦魁
建立集合
使用 { }或 set 建立集合
集合是唯一且無序的
A = {1,2,2,3}
print(A)
print(type(A))
B =set(“CanYouHear?”)
print(B)
C =set([“Hi”,”Elle”,”HI”])
print(C)
D = {}
print(type(D))
E = set(D)
print(type(E))
執行結果
刪除重複資料
利用唯一性這一個特點，對於刪除重複資料這一點很有效率
可先用Set把串列資料轉成集合，再把集合用List轉成串列就可以了
A = [1,2,2,3,4,4,4,4,9,5,5]
print(A)
B = set(A)
C = list(B)
print(C)
執行結果
集合的操作
交集 (intersection) 數學符號 : A∩B PYTHON符號 : &
聯集(union) : 數學符號 : A ∪ B PYTHON符號 : |
差集(difference) : PYTHON符號 : : –
對稱差集(symmetric difference) PYTHON符號 : ^
等於 PYTHON符號 : ==
不等於 PYTHON符號 : !=
是成員 PYTHON : in
不是成員 PYTHON符號 : not in
English = {“Abby”,”Susan”,”Cathy”,”Kiki”}
Japanese ={“Lucy”,”Ally”,”Nini”,”Kiki”}
print(English,”English”)
print(Japanese,”Japanes”)
#交集 (intersection)
intersection01 = English & Japanese
intersection02 = English.intersection(Japanese)
print(intersection01,”交集”)
print(intersection02,”交集”)
#聯集(union)union01 = English | Japanese
union02 = English.union(Japanese)
print(union01,”聯集”)
print(union02,”聯集”)
#差集(difference)
English_only = English – Japanese
English_only01 = English.difference(Japanese)
Japanese_only = Japanese – English
Japanese_only01 = Japanese.difference(English)
print(English_only,”差集”)
print(English_only01,”差集”)print(Japanese_only,”差集”)
print(Japanese_only01,”差集”)
#對稱差集(symmetric difference)
NO = English ^ Japanese
NO1 = English.symmetric_difference(Japanese)
print(NO,”對稱差集”)
print(NO1,”對稱差集”)
執行結果
A = {1,2,3,4,5}
B = {2,4,3,1,5}
C = {9,8}
print(“A=B?”,A==B)
print(“A=C?”,A==C)
print(“A=B?”,A!=B)
print(“A=C?”,A!=C)
D = set(“apple”)
print(“a在裡面嗎?”,”a”in D)
print(“f在裡面嗎?”,”f”in D)
print(“a不在裡面嗎?”,”a” not in D)
print(“f不在裡面嗎?”,”f”not in D)
for word in D:
print( word )
E = {“Nini”,”Susan”,”Gigi”}
print(“Nini在裡面嗎?”,”Nini”in E)
print(“MIMI在裡面嗎?”,”MIMI”in E)
print(“Nini不在裡面嗎?”,”Nini” not in E)
print(“MIMI不在裡面嗎?”,”MIMI” not in E)
for name in E:
print(name)
執行結果
執行結果
