文件的基本操作

Posted 2021-01-03 liuhongshuai

r读  w写   a追加   b以二进制方式 

#r rb读

#r rb读
# f=open(‘a.txt‘,‘r‘,encoding=‘utf-8‘)
# data=f.read()
# print(data)
# f.close()
#
# with open(‘a.txt‘,‘rb‘) as f:
#     data=f.read()
#     print(data)

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#w wb写 没有即创建 有则覆盖

#w wb写 没有即创建 有则覆盖
# with open(‘a.txt‘,‘w‘,encoding=‘utf-8‘)as f:
#     f.write(‘welcome‘)
#
# with open(‘a.txt‘,‘wb‘)as f:
#     f.write(‘welcome to beijing‘.encode(‘utf-8‘))

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# a ab追加

# a ab追加
# with open(‘a.txt‘,‘a‘,encoding=‘utf-8‘)as f:
#     f.write(‘shandong‘)
#
# with open(‘a.txt‘,‘ab‘)as f:
#     f.write(‘welcome to jinan‘.encode(‘utf-8‘))

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# r+ r+b读写

# r+ r+b读写
# with open(‘a.txt‘,‘r+‘,encoding=‘utf-8‘)as f:
#     data=f.read()
#     print(data)
#     f.write(‘hello‘)

# with open(‘a.txt‘,‘r+b‘)as f:
#     data=f.read()
#     print(data)
#     f.write(bytes(‘hello‘,encoding=‘utf-8‘))

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#read readline readlines

#read readline readlines
# f=open(‘a.txt‘,‘r‘,encoding=‘utf-8‘)
# print(f.read(5))#读取指定字符
# print(f.readline())#一行一行读
# print(f.readlines())#将内容按行封装成一个列表 换行符为

# f.close()

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# seek按字节定光标的位置
# tell告诉你光标的位置

# seek按字节定光标的位置
# tell告诉你光标的位置
# with open(‘a.txt‘,‘r‘,encoding=‘utf-8‘) as f:
#     data=f.read(10)
#     print(data)
#     f.seek(0)
#     print(f.read())
#     print(f.tell())
#     print(f.readable())#是否可读
#     print(f.writable())#是否可写

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