集合相关操作函数

Posted 2021-11-27 huangjiangyong

# ### 集合相关操作 (交差并补)
#intersection() 交集
set1 = {"周杰伦","王文","刘德华"}
set2 = {"周润发","周星星","王文"}
res = set1.intersection(set2)
print(res)
res = set1 & set2
print(res)
 
#difference()   差集
set1= {"方贵权","黄一真","黄少正","黄熊大","皇阿玛"}
set2 = {"邓远文","王俊文","黄文","黄熊大"}
res = set1.difference(set2)
print(res)
res = set1 - set2
print(res)
   
#union()  并集 
set1= {"方贵权","黄一真","黄少正","黄熊大","皇阿玛"}
set2 = {"邓远文","王俊文","黄文","黄熊大"}
res = set1.union(set2)
print(res)  
res = set1 | set2
print(res)

#symmetric_difference() 对称差集 (补集情况涵盖在其中)
set1= {"方贵权","黄一真","黄少正","黄熊大","皇阿玛"}
set2 = {"邓远文","王俊文","黄文","黄熊大"}
res = set1.symmetric_difference(set2)
print(res)
res = set1 ^ set2
print(res)

#issubset()   判断是否是子集
set1 = {"王文","王俊文","黄文"}
# set2 = {"王文","王俊文","黄文"}
set2 = {"黄文"}
res = set2.issubset(set1)
print(res)
# 真子集:2个集合不是完全一样的
res  =set2 < set1  # <=
print(res)

#issuperset() 判断是否是父集
set1 = {"王文","王俊文","黄文"}
set2 = {"黄文"}
res = set1.issuperset(set2)
print(res)
res = set1 > set2 # >=
print(res)

#isdisjoint() 检测两集合是否不相交  不相交 True  相交False
set1 = {"王文","王俊文","黄文"}
set2 = {"黄文"}
res = set1.isdisjoint(set2)
print(res)

# ### 集合相关函数

# (1) 增
#add()    向集合中添加数据
setvar = {"王文","王俊文","黄文"}
setvar.add("张耀文")
print(setvar)

#update() 迭代着增加 update(可迭代性数据)
setvar.update(["陈文江","姜文"])
print(setvar)

# (2) 删除
#clear()  清空集合
setvar = {"王文","王俊文","黄文"}
setvar.clear()
print(setvar)

#pop()     随机删除集合中的一个数据
setvar = {"王文","王俊文","黄文"}
setvar.pop()
print(setvar)

#remove()  删除集合中指定的值(不存在则报错)
setvar = {"王文","王俊文","黄文"}
setvar.remove("黄文")
# setvar.remove("黄133文") error 
print(setvar)

#discard() 删除集合中指定的值(不存在的不删除 推荐使用)
setvar = {"王文","王俊文","黄文"}
res = setvar.discard("黄133文")
print(setvar)
# print(res)

# ###冰冻集合  (只能做交叉并补)
# frozenset 可强转容器类型数据变为冰冻集合
# 冰冻集合一旦创建,不能在进行任何修改,只能做交叉并补操作

# (1) 声明空的冰冻集合
fz = frozenset()
print(fz,type(fz))

fz1 = frozenset([1,2,3,4])
print(fz1,type(fz1))
# fz2 = frozenset("2345")
fz2 = frozenset((2,3,4,5))
print(fz2,type(fz2))

res = fz1 & fz2
print(res)

# fz1.add("890") # error 不允许添加或者删除操作.