If you see a piece of code like this, it rings the bell that the person has no idea what he/she is doing:

Bad Pattern:

    my_list = np.array(xxx)
    summed = []
    for row in my_list:
        summed.append(np.sum(row))

    my_list = np.array(xxx)
    
    def get_summed(arr):
        return np.sum(arr)

    summed = []
    for i in range(len(my_list)):
        summed.append(
            get_summed(my_list[i])
        )
        

    # np.array(xxx) is redundant
    summed = np.sum(xxx, axis=1)