Python套接字，从服务器请求文件然后等待接收它

Question

我试图从我的客户端使用特定的文件名向我的服务器发送一个字符串，然后将该文件发送到客户端。出于某种原因，即使收到所有文件后它也会挂起。它挂在：

m = s.recv(1024)

client.朋友

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("192.168.1.2", 54321))
s.send(b"File:test.txt")
f = open("newfile.txt", "wb")
data = None
while True:
    m = s.recv(1024)
    data = m
    if m:
        while m:
            m = s.recv(1024)
            data += m
        else:
            break
f.write(data)
f.close()
print("Done receiving")

server.朋友

import socket
import os

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("", 54321))

while True:
    client_input = c.recv(1024)
    command = client_input.split(":")[0]
    if command == "File":
        command_parameter = client_input.split(":")[1]
        f = open(command_parameter, "rb")
        l = os.path.getsize(command_parameter)
        m = f.read(l)
        c.sendall(m)
        f.close()