CODEWITHSUNDEEP
pythonsocketspython-3.xdictionary
Alex
Alex

Reputation: 44345

How to send the content of a dictionary properly over sockets in python3x?

Using sockets in python3.x I want to send the content of a dictionary over a socket, which for some reasons is NOT answered by the link just above this line...

client.py:

a = {'test':1, 'dict':{1:2, 3:4}, 'list': [42, 16]}
bytes = foo(a)
sock.sendall(bytes)

server.py: 

bytes = sock.recv()
a = bar(bytes)
print(a)

How to convert any dictionary to a sequence of bytes (to be able to be sent through a socket) and how to be converted back? I prefer a clean and simple way to do this.

What I have tried so far: 

sock.sendall(json.dumps(data))
TypeError: 'str' does not support the buffer interface

sock.sendall(bytes(data, 'UTF-8'))
TypeError: encoding or errors without a string argument

data = sock.recv(100)
a= data.decode('UTF-8')
AttributeError: 'str' object has no attribute 'decode'

Upvotes: 4

Views: 13938

Answers (1)

dano
dano

Reputation: 94891

This is primarily summarizing the comments, but you need to convert the dict to a json str object, convert that str object to a bytes object by encoding it, and then send that over the socket. On the server-side, you need to decode the bytes object sent over the socket back to a str, and then use json.loads to turn it back into a dict.

Client:

b = json.dumps(a).encode('utf-8')
s.sendall(b)

Server:

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('localhost', 1234))
s.listen(1)
conn, addr = s.accept()
b = b''
while 1:
    tmp = conn.recv(1024)
    b += tmp
d = json.loads(b.decode('utf-8'))
print(d)

Upvotes: 12

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