【python基础】——集合操作

我会带着你远行 2022-05-19 23:14 277阅读 0赞

\#集合(确定的无序的一组数据)  
\#基本操作  
\#创建集合  
\#空集合  
var = set()  
print(var,type(var))  
  
  
\#具有数据的集合  
var = \{'zhangwang','zhangbo','zhanglang'\}  
print(var,type(var))  
  
  
\#成员检测  
result = 'zhangbo' in var  
print(result)  
  
  
result = 'zhangsan' not in var  
print(result)  
  
  
\#集合推导式  
var = \{'蚂蚱','螳螂','蝈蝈','蛐蛐'\}  
  
  
\#基本的集合推导式  
result = \{'\*'+i+'\*' for i in var\}  
print(result)  
  
  
\#带有判断条件的集合推导式  
result = \{i for i in var if i != '蛐蛐'\}  
print(result)  
  
  
\#多循环集合推导式  
colors = \{'red','blue','pink'\}  
sizes = \{36,37,38,39\}  
result = \{c + str(s) for c in colors for s in sizes\}  
print(result)  
  
  
\#集合函数  
'''  
\#add()  向集合中添加元素  
girls = \{'mf','sl','yj'\}  
girls.add('xf')  
print(girls)  
  
  
\#pop()  随机删除集合中的一个元素  
boys = \{'bd','zw','jl','zy'\}  
result = boys.pop()  
print(boys)  
print(result)  
  
  
\#remove()  删除集合中指定的元素  删除不存在的元素会报错  
boys = \{'bd','zw','jl','zy'\}  
boys.remove('zy')  
print(boys)  
  
  
\#discard()  删除集合中指定的元素  删除不存在的元素啥都不做  
boys = \{'bd','zw','jl','zy'\}  
boys.discard('zy1')  
print(boys)  
  
  
\#clear()  清空集合  
boys = \{'bd','zw','jl','zy'\}  
boys.clear()  
print(boys)  
  
  
\#copy()  复制集合  
boys = \{'bd','zw','jl','zy'\}  
newboys = boys.copy()  
print(newboys)  
'''  
  
  
\#difference() 计算2个集合的差集  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
result = dreamers.difference(girls)\# result = a + b  
print(result)  
  
  
\#difference\_update()  计算2个集合的差集(差集更新操作)  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
dreamers.difference\_update(girls)\#a = a + b  a += b  
print(dreamers)  
  
  
\#union()  并集操作  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
result = dreamers.union(girls)  
print(result)  
  
  
\#update()  并集更新操作  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
dreamers.update(girls)  
print(dreamers)  
  
  
\#intersection()  计算2个集合的交集  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
result = dreamers.intersection(girls)  
print(result)  
  
  
\#intersection\_update  交集更新操作  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
dreamers.intersection\_update(girls)  
print(dreamers)  
  
  
\#超集和子集  
boys = \{'zzy','yqw','dw','wzc','lyb','wym','chy'\}  
zoudu = \{'wzc','lyb','wym'\}  
girls = \{'lsy','mmf','syj'\}  
  
  
\#issuperset()  检测当前集合是否是另一个集合的超集  
result = boys.issuperset(zoudu)  
print(result)  
  
  
\#issubset()  检测当前集合是否是另一个集合的子集  
result = zoudu.issubset(boys)  
print(result)  
  
  
\#isdisjoint()  检测2个集合是否不存在交集  存在交集 False  
result = boys.isdisjoint(girls)  
print(result)  
  
  
\#symmetric\_difference()  对称差集  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
result = dreamers.symmetric\_difference(girls)  
print(result)  
  
  
\#symmetric\_difference\_update()  对称更新差集  
dreamers = \{'ljl','wc','xy','zb','lsy'\}  
girls = \{'mmf','lsy','syj'\}  
dreamers.symmetric\_difference\_update(girls)  
print(dreamers)  
  
  
\#冰冻集合  
\#冰冻集合是一种特殊的集合类型,也是集合(集合是列表的话,冰冻集合就是元组)  
\#创建冰冻集合  
\#一般不会创建空的冰冻集合  
var = frozenset()  
print(var,type(var))  
  
  
\#带有数据的冰冻集合  
var = frozenset(('qs','szx','bjh','acs'))  
print(var,type(var))  
  
  
\#成员检测  
result = 'szx' in var  
print(result)  
  
  
\#遍历冰冻集合  
for i in var:  
    print(i)  
  
  
\#集合推导式(无法得到冰冻集合,可以得到集合,列表,元组,字典类型)  
result = \{i for i in var\}  
print(result,type(result))  
  
  
\#函数  
\#冰冻集合可以使用集合的函数(不修改集合本身的函数都可以使用)  
var = frozenset(('qs','szx','bjh','acs'))  
  
  
\#copy()  
result = var.copy()  
print(result)  
  
  
\#集合操作  交集,并集,差集,对称差集等  不修改冰冻集合本身就能使用:冰冻集合的操作结果都是冰冻集合  
var1 = frozenset(('qs','szx','bjh','acs'))  
var2 = \{'szx','bjh','lc','wb'\}  
  
  
\#冰冻集合操作  
result = var1.union(var2)  
print(result)  
  
  
\#普通集合操作(冰冻集合是参考集合)  
result = var2.union(var1)  
print(result)