python socket 数据传输小记

In python 3, bytes strings and unicodestrings are now two different types. Since sockets are not aware of string encodings, they are using raw bytes strings, that have a slightly differentinterface from
unicode strings.

So, now, whenever you have a unicode stringthat you need to use as a byte string, you need toencode() it. And whenyou have a byte string, you need to decode it to use it as a regular(python 2.x) string.

Unicode strings are quotes enclosedstrings. Bytes strings are b"" enclosed strings

 

When you use client_socket.send(data),replace it by client_socket.send(data.encode()). When you get datausing data = client_socket.recv(512), replace it by data =client_socket.recv(512).decode()

python作者  在python3 更新时  相对于2做出了改进：

将字符串变成了 Unicode，文件默认编码变成了utf-8 

将str 与 bytes 做出了明确区分，str就是单纯的Unicode格式的字符，bytes就是单纯的二进制（在python2里面 Unicode与str类型，str与bytes类型的关系很混乱，具体想了解，自行百度）