How do I retrieve a username with Python keyring?

While keyring was only designed to store passwords, you can abuse get_password to store the username separately.

import keyring

# store username & password
keyring.set_password("name_of_app", "username", "user123")
keyring.set_password("name_of_app", "password", "pass123")

# retrieve username & password
username = keyring.get_password("name_of_app", "username")
password = keyring.get_password("name_of_app", "password")

Alternatively, if you want to keep the username paired with the password:

import keyring

service_id = "name_of_app"
username = "user123"

# store username & password
keyring.set_password(service_id, "username", username)
keyring.set_password(service_id, username, "pass123")

# retrieve username & password
username = keyring.get_password(service_id, "username")
password = keyring.get_password(service_id, username)

Credit to Dustin Wyatt & Alex Chan for this solution.

On Windows I was able to get both username and password (i.e. the "credentials") using

c = keyring.get_credential("servicename", None)

Note that this does not work on macOS, the keyring backend does not have capabilities to search for entries - i.e. you need to know the username. I suppose that native code would allow you to do this, though, see official docs

You are expected to have stored the username somewhere else.

The keyring only stores the password, keyed by the application name and username.