1 # 删除索引为偶数的元素
 2 # 方法一
 3 # li = [22, 33, 44, 55, 66]
 4 # for i in range(len(li)-1, -1, -1):
 5 #     if i % 2 == 0:
 6 #         del(li[i])
 7 #         print(li)
 8 # 方法二
 9 # li2 = li[1:4:2]
10 # li = li2
11 # print(li2)
12
13 # 错误/不可得到所需列表
14 # for i in li:
15 #     if li.index(i) % 2 == 0:
16 #         del li[li.index(i)]
17 #         print(li)
18 # for i in range(len(li)):
19 #     if i % 2 == 1:
20 #         del li[i]
21 #         print(li)  # [33, 44, 55, 66]
22 #                      [33, 44, 66]

 1 # 去除key值中含有k的值
 2 dic = {"k1": "22", "k2": "44", "a1": "55"}
 3 # 方法一
 4 # li = []
 5 # for i in dic.keys():
 6 #     if "k" in i:
 7 #         li.append(i)
 8 # for i in li:
 9 #     del dic[i]
10 # print(dic)
11 # 方法二
12 # dic1 = {}
13 # for i in dic.keys():
14 #     if "k" not in i:
15 #         dic1.setdefault(i, dic[i])
16 # dic = dic1
17 # print(dic)

1 # set = {1, 2, 3, (1, 2, 3)}
2 set = set({1, 2, 3, 6})
3 print(set, type(set))

set1 = {'alex','wusir','ritian','egon','barry'}
set1.add('宝女神')
print(set1)#update：迭代着增加
set1.update('A')
print(set1)
set1.update('老师')
print(set1)
set1.update([1,2,3])
print(set1)

 1 set1 = {'alex','wusir','ritian','egon','barry'}
 2
 3 set1.remove('alex')  # 删除一个元素
 4 print(set1)
 5
 6 set1.pop()  # 随机删除一个元素
 7 print(set1)
 8
 9 set1.clear()  # 清空集合
10 print(set1)
11
12 del set1  # 删除集合
13 print(set1)

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

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

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

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

1 set1 = {1,2,3}
2 set2 = {1,2,3,4,5,6}
3
4 print(set1 < set2)
5 print(set1.issubset(set2))  # 这两个相同，都是说明set1是set2子集。
6
7 print(set2 > set1)
8 print(set2.issuperset(set1))  # 这两个相同，都是说明set2是set1超集。

1 s = frozenset('barry')
2 print(s,type(s))  # frozenset({'a', 'y', 'b', 'r'}) <class 'frozenset'>

 1 l1 = [1,2,3,['barry','alex']]
 2
 3 l2 = l1.copy()
 4 print(l1,id(l1))  # [1, 2, 3, ['barry', 'alex']] 2380296895816
 5 print(l2,id(l2))  # [1, 2, 3, ['barry', 'alex']] 2380296895048
 6 l1[1] = 222
 7 print(l1,id(l1))  # [1, 222, 3, ['barry', 'alex']] 2593038941128
 8 print(l2,id(l2))  # [1, 2, 3, ['barry', 'alex']] 2593038941896
 9
10 l1[3][0] = 'wusir'
11 print(l1,id(l1[3]))  # [1, 2, 3, ['wusir', 'alex']] 1732315659016
12 print(l2,id(l2[3]))  # [1, 2, 3, ['wusir', 'alex']] 1732315659016

 1 import copy
 2 l1 = [1,2,3,['barry','alex']]
 3 l2 = copy.deepcopy(l1)
 4
 5 print(l1,id(l1))  # [1, 2, 3, ['barry', 'alex']] 2915377167816
 6 print(l2,id(l2))  # [1, 2, 3, ['barry', 'alex']] 2915377167048
 7
 8 l1[1] = 222
 9 print(l1,id(l1))  # [1, 222, 3, ['barry', 'alex']] 2915377167816
10 print(l2,id(l2))  # [1, 2, 3, ['barry', 'alex']] 2915377167048
11
12 l1[3][0] = 'wusir'
13 print(l1,id(l1[3]))  # [1, 222, 3, ['wusir', 'alex']] 2915377167240
14 print(l2,id(l2[3]))  # [1, 2, 3, ['barry', 'alex']] 2915377167304

1 li = ['kk','gg','uu','en','55']
2 for i in enumerate(li):
3     print(i)
4 for index,name in enumerate(li,1):
5     print(index,name)
6 for index, name in enumerate(li, 100):  # 起始位置默认是0，可更改
7     print(index, name)