Can you give me an example of a python script that opens an api point and serves a string?
Sure! Here's an example Python script that uses the Flask web framework to create a simple API endpoint that serves a string:

``` 
from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, world!'

if __name__ == '__main__':
    app.run()

``` 

In this script, we first import the Flask class from the flask module. Then we create a new instance of the Flask class, using the __name__ variable to specify the name of the application.
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Next, we define a new route using the @app.route() decorator. This decorator tells Flask to map requests to the root URL ("/") to the hello_world() function.
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Finally, we use the if __name__ == '__main__': block to start the Flask application when the script is executed. By default, the application will run on port 5000.
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You can run this script and test the API by opening a web browser and navigating to http://localhost:5000/. You should see a simple "Hello, world!" message displayed in your browser.