day007 基本数据类型（set）

一、set

　　集合：可变的数据类型，他里面的元素必须是不可变的数据类型，无序，不重复。

set1 = set({1,2,3})
print(set1)
print(set2)
set1 = {'alex','wusir','ritian','egon','barry',}

# 增  add、update
set1.add('女神')
print(set1)

set1.update('abc')
print(set1)


#删除
set1.pop()  # 随机删除
print(set1.pop())  # 有返回值
print(set1)

set1.remove('alex')  # 按元素
print(set1)

set1.clear()
print(set1)  # set()

del set1
print(set1)

#查
for i in set1:
    print(i)

set1 = {1,2,3,4,5}
set2 = {4,5,6,7,8}
set3 = set1 & set2
print(set3)  # {4, 5}
print(set1.intersection(set2))  # {4, 5}

set1 = {1,2,3,4,5}
set2 = {4,5,6,7,8}
print(set1 | set2)  # {1, 2, 3, 4, 5, 6, 7,8}
print(set2.union(set1))  # {1, 2, 3, 4, 5, 6, 7}

set1 = {1,2,3,4,5}
set2 = {4,5,6,7,8}
print(set1 ^ set2)  # {1, 2, 3, 6, 7, 8}
print(set1.symmetric_difference(set2))  # {1, 2, 3, 6, 7, 8}

set1 = {1,2,3,4,5}
set2 = {4,5,6,7,8}
print(set1 - set2)  # {1, 2, 3}


# set1独有的
print(set1.difference(set2))  # {1, 2, 3}

set1 = {1,2,3,}
set2 = {1,2,3,4,5,6}

print(set1 < set2)
print(set1.issubset(set2))  # 这两个相同，都是说明set1是set2子集。

print(set2 > set1)
print(set2.issuperset(set1))  # 这两个相同，都是说明set2是set1超集。


#去重
li = [1,2,33,33,2,1,4,5,6,6]
set1 = set(li)
# print(set1)
li = list(set1)
print(li)
s1 = {1,2,3}
print(s1,type(s1))

s = frozenset('barry')
print(s,type(s))
for i in s:
    print(i)

二、深浅copy

# copy
l1 = [1,2,3]
l2 = l1.copy()
print(l1,l2)
print(id(l1),id(l2))
l2.append('a')
print(l1,l2)

l1 = [1,2,[4,5,6],3]
l2 = l1.copy()
print(l1,id(l1))
print(l2,id(l2))

l1.append('a')
print(l1,l2)
l1[2].append('a')
print(l1,l2)
print(id(l1[2]))
print(id(l2[2]))

import copy
# copy
l1 = [1,2,[4,5,6
l1 = [1,2,3]
l2 = l1.copy()
print(l1,l2)
print(id(l1),id(l2))

l2.append('a')
print(l1,l2)


l1 = [1,2,[4,5,6],3]
l2 = l1.copy()

print(l1,id(l1))
print(l2,id(l2))
l1.append('a')
print(l1,l2)
l1[2].append('a')
print(l1,l2)],3]

l2 = copy.deepcopy(l1)
print(l1,id(l1))
print(l2,id(l2))
l1[2].append('a')
print(l1,l2)