Play sound at wanted frequency

[Matteo]

I need to playback a sound on a linux machine of a pre-determined
frequency like, say, 440 Hz. How can I do that with python? I found
the ossaudiodev package, but it says that the ossaudiodev.write()
method accepts data as a raw string. It doesn't explain what the
string should be like, and the oss documentation is mainly about C++.

Do you have any tips to share?