#!/usr/bin/env python

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

# Author:Vergil Zhang

list_1 = [1, 4, 5, 7, 3, 6, 7, 9]

list_1 = set(list_1)

print(list_1, type(list_1))

list_2 = set([2, 6, 0, 66, 22, 8])

print(list_1,list_2)

#交集

print(list_1.intersection(list_2))

print(list_1 & list_2)

#并集

print(list_1.union(list_2))

print(list_1 | list_2)

#差集，list_1有而list_2没有的

print(list_1.difference(list_2))

print(list_1 - list_2)

list_3 = set([1,3,7])

print(list_3.issubset(list_1))          #判断是否为子集

print(list_1.issuperset(list_3))        #判断是否是父集

#反向差集，取出两个互相没有的

print(list_1.symmetric_difference(list_2))

print(list_1 ^ list_2)

list_4 = set([5,6,8])

print(list_3.isdisjoint(list_4))            #如果两个集合没有交集则return true

#向集合中添加

list_1.add('x')

list_1.update(['a', 'v', 'b'])

print(list_1)

#删除

list_1.remove('a')          #删除不存在的元素会报错

list_1.discard('v')     #删除不存在的元素不会报错

print(len(list_1))      #list_1的长度

print('a' in list_1)        #判断'a'是否在list_1中

#判断x中的每一个元素是否都在list_1中

x = {1, 3}

print(x.issubset(list_1))

print(x <= list_1)

#判断x中的每一个元素是否都在list_1中

print(list_1.issuperset(x))

print(list_1 >= x)

#!/usr/bin/env python

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

# Author:Vergil Zhang

#data = open("yesterday.txt", encoding='utf-8').read()

#print(data)

#获取文件句柄

file = open("PLANET.txt", 'r', encoding='utf-8')

#print(file.write("我爱北京天安门"))            #只是追加内容，在进行其他操作就会报错

#print(file.read())

#读文件

for line in file.readlines():

    print(line.strip())

#low loop method

for index,line in enumerate(file.readlines()):

    if index == 9:

        print('-----------这一行不打印歌词-----------------')

        continue

    print(line.strip())

#推荐

count = 0

for line in file:

    if count == 9:

        print(line)

        count += 1

        continue

    print(line)

    count += 1

print(file.tell())      #打印出句柄的位置，以字符的个数为准

print(file.readline())

print(file.tell())

file.seek(0)        #回到首字符

print(file.encoding)        #文件的编码形式

print(file.fileno())            #文件的编号，操作系统维护，不需要关注

print(file.isatty())            #是否是终端设备

print(file.seekable())          #光标是否可移

print(file.flush())     #缓存中内容刷到硬盘中

#强制刷到硬盘

#模拟进度条

import sys

import time

for i in range(20):

    sys.stdout.write("#")

    sys.stdout.flush()

    time.sleep(0.1)

file.close()

'''

file = open("PLANET.txt", 'a', encoding='utf-8')

file.truncate(10)

file.close()

file = open("PLANET.txt", 'w+', encoding='utf-8')

file.write("lalallalallala........")

file.close()

file = open("PLANET.txt", 'rb')

print(file.readline())

file.close()

'''

file_old = open("PLANET.txt", 'r', encoding="utf-8")

file_new = open("PLANET_after.txt", 'w', encoding="utf-8")

for line in file_old:

    if "我就是你的行星 围绕在你周围" in line:

        line = line.replace("我就是你的行星", "Vergil就是Ann的行星")

    file_new.write(line)

file_old.close()

file_new.close()

#使用自动关闭

with open("PLANET.txt", 'r', encoding="utf-8") as file:

    for line in file:

        print(line.strip())