我在客户端和服务器中的recv行添加这些发送行后，无法运行我的代码。我不知道出了什么问题。没有它们，程序运行得很好。我只是为了便于调试而粘贴最小的代码，因为没有这些代码，代码就是完美的。
Client.py
print ('Opening file for editting.....')
with open('C:\\Users\\dell\\Desktop\\received_file.txt', 'ab') as e:
e.write('Ya Allah tera shukar')
e.close()
print ('Editting Done!!!')
s.send("Trial Message")
s.close()
print ("Connection closed")
Server.py
while (l): #Keep sending it until EOF id found
conn.send(l) #Keep sending the opened file
print(repr(l)) #repr(1) gives the string representation of contents of the file. The repr() of a string adds string quotes and backslashes:
l = f.read(1024) #Keep reading the opened file so the contents appear on the server too
f.close()
print('Done sending the file')
print conn.recv(1024) #This is not receiving the trial message sent by client
conn.send('Thank you for connecting')
conn.close()