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 Environment variables setup
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Python SDK can be partially configured using environment variables. Values passed this way may be overwritten
by explicit passing of arguments into the constructor.

Supported variables:
  * **FLIGHT_SERVICE_LOCATION** - sets flight service location
  * **FLIGHT_SERVICE_PORT** - sets flight service port
  * **WX_CLIENT_VERIFY_REQUESTS** - sets verify parameter for http requests
  * **USER_ACCESS_TOKEN** - sets access token for requests, the token may expire with time
  * **RUNTIME_ENV_ACCESS_TOKEN_FILE** - sets path to file, where is stored access token, the token may expire with time
  * **PROJECT_ID** - sets default project id
  * **SPACE_ID** - sets default space id
  * **RUNTIME_ENV_APSX_URL** - sets base endpoint

**Example of passing url and token via environment variables:**

.. code-block:: python

    # RUNTIME_ENV_APSX_URL is set to watsonx.ai url
    # USER_ACCESS_TOKEN is set to watsonx.ai generated token

    from ibm_watsonx_ai import APIClient, Credentials

    # values can be passed as usual to overwrite environment variables, but can be entirely omitted
    api_client = APIClient(Credentials())