Python TypeError: can't concat bytes to str

Question

I am trying to sending a data with socket and I am having problem named "builtins.TypeError: can't concat bytes to str" .

It's the packet I am trying to send:

pack('!i', int(0))+pack('!b', int(this.lastPacketID))+pack('!h', int(2))+"br"+pack('!h', int(2))+"br"+pack('!i', int(this.authKey))+pack('!i', int(this.authKeyLogin))

Answer 1

"br" is a string, and pack returns a bytes object. replace "br" with b"br" and it should work

Answer 2

pack()返回一个字节对象，而"br"是一个字符串对象，通常您需要编码一个字符串以将其转换为字节，但是在您的情况下，您可以通过使python将"br"视为字节来解决此问题： b"br"