python code snippet

[chinna]

Hi,
Im new to Python and trying to understand some existing code.
Can some one please explain the below code snippet and its function.

 
f = lambda x : (
            [L[i] 
            for i in range(2) 
            if x >= 10 and x < 20]
            [0])
        
        return np.vectorize(f, otypes=[np.uint32])(Array)

Thanks in advance.