Why am I not getting a refresh-token for when I ask for an access token?

I am using the python-youtube SDK to upload videos to Youtube but first I need to authenticate

Here is the authentication code.

cli = Client(client_id="[my client id]", client_secret="[my client secret]")# Get authorization urlprint(cli.get_authorize_url())# Copy the redirected url after login in.print(cli.generate_access_token(authorization_response="[link from redirect]"))# response = AccessToken(access_token='token', expires_in=3599, token_type='Bearer')cli = Client(access_token="[Access token from previous response]")

On the docs it says that I should get a refresh token but knowhere on the responses does it come up.