python 遍历列表每次遍历两个元素

问题:
例如:
li= [1,2,3,4,5,6,7,8,9,10]
想要输出:
[1,2]
[3,4]
[5,6]
[7,8]
[9,10]

方案一:
对列表进行拆分:
def test1():
    onum=[]
    jnum=[]
    for i in ewr:
        if i%2==0:
            onum.append(i)
        else:
            jnum.append(i)
    for i,j in zip(jnum,onum):
        print(i,j)

方案二:
def test2():
    for i in range(4):
        ret = ewr[0:2]
        print(ret)
        for i in ret:
            ewr.remove(i)