'Python: why for loop is in the middle of join() function?

I don't understand the following code in the return statement. How come a for loop is inside a built-in function, join(), and not at the beginning in the middle of statement?

How is this working?

def randomString(stringLength=10):
    """Generate a random string of fixed length """
    letters = string.ascii_lowercase
    return ''.join(random.choice(letters) for i in range(stringLength))
pythonfor-loop


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