Python encoding issue through sockets

Question

I am creating a short python script which requires me to send text back and forth between two computers via sockets. Now when I try to test my application locally on the same computer using telnet and it requires me to use the 'utf-8' encoding when I use the bytes() function as such:

connection.sendall(bytes("Unknown command", 'UTF-8'))

All works well locally, but when I try to test my application remotely on a raspberry pi and connect my computer through telnet I get the following error

TypeError: str() takes at most 1 argument (2 given)

After a bit of research I found that if I remove the utf encoding it will work remotely as such:

connection.sendall(bytes("Unknown command"))

But then this causes an error when I test locally. It says I must use an encoding. Why is this happening?

Can you confirm the Python version on each device? I think you are using Python 3 but the Pi is using Python 2. In Python 2 (later) bytes -> str. — Two-Bit Alchemist
– Two-Bit Alchemist, Commented May 27, 2015 at 17:43

Padraic Cunningham · Accepted Answer · 2015-05-27 17:44:06Z

3

You are using two different versions of python py2 vs 3.

Python2:

In [1]: bytes("Unknown command", 'UTF-8') 
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-1-ddc681192da0> in <module>()
----> 1 bytes("Unknown command", 'UTF-8')

TypeError: str() takes at most 1 argument (2 given)

Python3:

In [1]: bytes("Unknown command", 'UTF-8')
Out[1]: b'Unknown command'

answered May 27, 2015 at 17:44

Padraic Cunningham

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1 Comment

Benjamin Over a year ago

Ahh ok, this makes sence. Thanks!

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