This uses the same API as FedEx's website does to track packages by tracking number. There is no account number, password, or API key required to use this API.
Here is an example of how to track a package:
from fedex import track_package
track_package(523664444388)
{'delivered': True, 'deliveryDate': '9/07/2021', 'deliveryTime': '12:35 pm', 'actualDeliveryDate': '2021-09-07T12:35:43-05:00', 'city': 'LEBANON', 'state': 'MO'}