parameter substitution in a binary string in python

Question

Python 3

I want to send a binary string over a socket. I am using

socket.send(b"Hello from {0}",client_id)

however I find the it is not properly substitution clientid.

what am I doing wrong? I do I accomplish this in a binary string

blhsing · Accepted Answer · 2021-07-21 01:27:12Z

1

{0} is a placeholder for the str.format method, which you should be using, but bytes objects do not have a format method; instead, you can format it as a string first and then convert it to bytes with the encode method:

socket.send("Hello from {0}".format(client_id).encode())

answered Jul 21, 2021 at 1:27

blhsing

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