bad_prepend.py

def bad_prepend(xs, ys):
    if not xs:
        return ys
    else:
        final_list = bad_prepend(xs[1:], ys)
        final_list.insert(0, xs[0])
        return final_list

x = [3,2,1]
y = [0,1,2]
ret = bad_prepend(x,y)

# prints [3,2,1, 0,1,2]
print(ret)

x = [6,7]
y[3] = 100

ret = bad_prepend(x,y)

# whats the output of the following??
print(x)
print(y)
print(ret)