Flatten list

def flattenList(x):
    finishedList = []
    if isinstance(x,list):
        for i in range(0,len(x)):
            finishedList.extend(flattenList(x[i]))
    else:
        finishedList.append(x)
    return finishedList


nestedList = [2, 1, [[3, 5], 4, 0, [], [5], 2], 4, [1, 7], 6]

print(flattenList(nestedList))