集合

s={1,2,3,4,5,6,7,8,9}
print(s)

s2 = set()

添加

s2.add(1)
print(s2)

去重

aba =[1,2,3,2,1,3,1,2,3]

print(set(aba))
print(list(aba))
print(list[set(aba)])

aaa ={'wangba','xiaoji','dada','xiaoxiao'}
bbb = {1,2,3,2,4,5,3,2,33,2,22,3,'xiaoxiao'}

长度

len(aba)
len(aaa)

'xiaoxiao' in aaa

并集

print(aaa|bbb)
print(aaa.union(bbb))

交集

print(aaa&bbb)

差集

print(aaa-bbb)

对称差集

print(aaa^bbb)

==

print(aaa==bbb)

<=

print(aaa<=bbb)

>=

print(aaa>=bbb)

<

print(aaa<bbb)

>

print(aaa>bbb)

s = set()

add 添加

s.add('wsad')
print(s)

remove 移除

s.remove('wsad')
print(s)

bbb = {1,2,3,2,4,5,3,2,33,2,22,3,'xiaoxiao'}
aaa ={'wangba','xiaoji','dada','xiaoxiao'}

print(aaa.difference(bbb))

bbb.discard(1)
print(bbb)

aaa.isdisjoint(bbb)

f =open(r'C:\Users\32758\Desktop\test.txt',encoding='utf-8')
print(f.read())
f.close()

f =open(r'D:\pyObject\pythonProject\学习\test.txt',encoding='utf-8')
print(f.readline())
print(f.readline())
print(f.readline())
print(f.readline())
f.close()

fw =open(r'D:\pyObject\pythonProject\学习\test.txt',mode='w',encoding='utf-8')
fw.write('hello 1 world\n')
fw.flush()
fw.close()

import sys
print(sys.path)

fr =open('学习/test.txt',mode='r',encoding='utf8')
text_data = fr.read()
print(text_data)

print(r'1\n2')
print(b'1\n2223441')

xie

with open('学习/test.txt','w',encoding='utf8') as fa:
fa.write('deep dark')

du

with open('学习/test.txt', 'r', encoding='utf8') as fr:
data = fr.read()
print(data)

with open('学习/test.txt','r',encoding='utf8') as fr:
print(fr.readable())
print(fr.writable())

指针

with open('学习/test.txt', 'r+', encoding='utf8') as frr:
frr.seek(0,0)
frr.write('大')
frr.flush()
print(frr.tell()) #光标位置 字节
print(frr.read(3)) #光标后字符数
frr.truncate() #截断
frr.flush()