python 文件打开b模式

# 文件打开模式b模式
#强调
# 1.与t模式类似不能单独使用,必须是rb,wb,ab
# 2.b模式下读写都是以bytes为单位的
# 3.b模式下一定不能指定encoding参数

# rb模式
# with open('字符编码.png','rb') as f:
#     data=f.read()
#     print(data)
#     print(type(data))

# with open('a.txt','rb') as f:
#     data=f.read()
#     #decode 把文件以什么字符编码打开
#     print(data.decode('utf-8'))#bytes--->unicode
#     print(type(data))

# wb模式
# with open('b.txt','wb') as f:
#     msg = '你好,小马哥'
#     encode 把文件以什么字符编码写入
#     f.write(msg.encode('utf-8'))

# t模式只能操作文本文件
# b模式可有操作任何文件,以二进制(bytes)显示

#ab模式
# with open('a.txt','ab') as f:
#     f.write('helio'.encode('utf-8'))
# with open('a.txt','r',encoding='utf-8') as f1,open('b.txt','a',encoding='utf-8') as f2:
#     for line in f1:
#         f2.write(line)


#     #decode 把文件以什么字符编码打开
#     print(data.decode('utf-8'))#bytes--->unicode
#     print(type(data))