How does the Accuweather data send the status code 401 to the Python program?

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The Accuweather API sends the status code 401 to the Python program when the API key provided is not valid or has expired. This means that the authentication process has failed and the program does not have access to the requested data. The Python program can handle this error by checking for the 401 status code and providing a new or updated API key to the Accuweather API in order to gain access to the requested data.