python中for循环怎么改成while循环？

Question

以下代码怎么改成while循环？

def maxnum(lst):
maxn = 0
for i in lst:
if maxn < i:
maxn = i
return maxn
def minnum(lst):
minn = lst[0]
for i in lst:
if minn > i:
minn= i
return minn
a = [3,4,6,7]
print(maxnum(a) - minnum(a))

Answer 1

def maxnum(lst):
    maxn = 0
    i = 0
    while i<len(lst):
        if maxn < lst[i]:
            maxn = lst[i]
        i+=1
    return maxn
def minnum(lst):
    minn = lst[0]
    i = 0
    while i<len(lst):
        if minn > lst[i]:
            minn= lst[i]
        i += 1
    return minn
a = [3,4,6,7]
print(maxnum(a) - minnum(a))

如有帮助，请采纳！