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There could be several reasons why the Javascript .fetch(api) is not functioning correctly when calling a Python API:

1. CORS: Cross-Origin Resource Sharing (CORS) is a security feature that prevents a webpage from making requests to a different domain than the one that served the page. Therefore, if your Python API is hosted on a different domain than your webpage, you need to enable CORS on your API server to allow your webpage to make requests to it.

2. Response format: Your Python API may not be returning the response in the correct format that the Javascript fetch function is expecting. Javascript typically expects a response in JSON format, so make sure that your Python API is returning the response in JSON format.

3. Network errors: There could be network errors that are preventing the Javascript fetch function from reaching the Python API. Check your network connection and make sure that the Python API is accessible from your network.

4. Authentication: If your Python API requires authentication, make sure that you are passing the correct credentials in the fetch request.