How do I retrieve a password from Keychain Access using keyring?

Question

"Keeping credentials safe in Jupyter Notebooks" (https://towardsdatascience.com/keeping-credentials-safe-in-jupyter-notebooks-fbd215a8e311) says that "Keyring integrates with your OS keychain manager... You would use it as"

import keyring
keyring.get_keyring()
keyring.get_password("system", "username")

On Mac Ventura 13.2.1, I open Keychain Access, click "Create a new Keychain item.", enter Keychain Item Name "PostgreSQL_Password", account name "tslever", and password "my_password". I restart Anaconda Navigator, JupyterLab, and a Jupyter Notebook. I enter

import keyring
keyring.get_keyring()
print(keyring.get_password("PostgreSQL_Password", "tslever"))

None is printed.