#!/usr/bin/env python

# -*- coding:utf-8 -*-

'''

str     int

'''

# str

s = ' a'

print(s.isspace())

'''

list:

'''

li_st = [11, 22, 33, 44, 55]

for i in range(len(li_st)):  # range()也是顾头不顾尾

   del li_st[i]    #del操作会更新列表

删掉所有偶数

for i in li_st:

    if i % 2 == 0:

        del li_st[li_st.index(i)]

print(li_st)

dic = {'k1': 'v1', 'k2': 'v2', 'a3': 'v3'}

dic1 = {}

#循环字典过程中,不能删除字典的键值对;

for i in dic:

    if 'k' in i:

        del dic[i]

for i in dic:

    if 'k' not in i:

        dic1.setdefault(i, dic[i])

dic = dic1

print(dic)

l = []

for i in dic:

    if 'k' in i:

        l.append(i)

for i in l:

    del dic[i]

print(dic)

# 转换成bool是false:

#       0 '' [] () {} set()

# 元组 如果元组里面只有一个元素且不加 逗号, 则此元素是什么类型,就是什么类型

tu1 = (1)

tu2 = (1,)

print(tu1,type(tu1))

print(tu2,type(tu2))

#!/usr/bin/env python

# -*- coding:utf-8 -*-

'''

集合:

 可变的数据类型;可以增删改查

 储存元素必须是不可变的数据类型

 无序,不重复,

 {}

'''

set1 = set({1, 2, 3})

set2 = {1, 2, 3, [1, 2, 3], {'name': 'alex'}} #报错,集合中的元素必须是可哈希的

print(set1)

print(set2)

set1 = {'alex', 'wusir', 'ritian', 'egon', 'barry', 'barry'}

# 集合建立时可以重复元素,会在建立过程中自动去重操作

# 增

# add

set1.add('godress')

print(set1)

update

set1.update('abc')

print(set1)

# 删

# pop 随机删除,集合为空的时候报错

name = set1.pop( )

print(name)

print(set1)

# remove 按元素删除,元素不存在报错

set1.remove('barry')

print(set1)

# 清空列表

set1.clear()

print(set1)

# del 删除整个集合

del set1

print(set1)

# 查

# 只能用for循环查询

for i in set1:

    print(i)

# 集合运算

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

set2 = {4, 5, 6, 7, 8}

set3 = set1 & set2

# 交集

print(set1 & set2)

print(set1.intersection(set2))

# 反交集

print(set1 ^ set2)

print(set1.symmetric_difference(set2))

# 并集

print(set1 | set2)

print(set1.union(set2))

# 差集

print(set1 - set2)

print(set1.difference(set2))

# 子集

set4 = {1, 2}

set5 = {1, 2, 3}

print(set4 < set5)

print(set4.issubset(set5))

# 超集

set4 = {1, 2}

set5 = {1, 2, 3}

print(set5 > set4)

print(set5.issuperset(set4))

# 将集合变为不可变数据类型,即只读集合

s = frozenset('barry')

print(s, type(s))

# 只能查询

for i in s:

    print(i)

#!/usr/bin/env python

# -*- coding:utf-8 -*-

# 赋值

# l1 = [1, 2, 3, ['a', 'b', 'c']]

# l2 = l1

# print('original L1:', l1)

# print('original L2:', l2)

#

# l2[3][0] = 'k'

# print('changed L2:', l2)

# print('changed L1:', l1)

#  因为赋值操作是直接把两个变量(L1,L2)同时指向同一个内存地址,所以动一发而牵全身

# 浅拷贝

# l1 = [1, 2, 3, ['a', 'b', 'c']]

# l2 = l1.copy()

# print('original L1:', l1)

# print('original L2:', l2)

#

# l2[0] = 4

# l2[3][1] = 'k'

# print('changed L2:', l2)

# print('changed L1:', l1)

#  浅拷贝:将拷贝对象的值拷贝到另一个内存地址,但是拷贝对象的子代仍是和原来指向同一个内存地址

# 深拷贝

# import copy

# l1 = [1, 2, 3, ['a', 'b', 'c']]

# l2 = copy.deepcopy(l1)

# print('original L1:', l1)

# print('original L2:', l2)

# l2[0] = 4

# l2[3][1] = 'k'

# print('changed L2:', l2)

# print('changed L1:', l1)

# print(l2 is l1)

# 深拷贝,将拷贝对象的值全部重新拷贝到新的内存地址里