作业005：列表不用方法实现

实现count的功能

nums = [2, 4, 3, 5, 6, 3, 6, 6, 8, 1, 3, 9]
n = int(input('请输入你需要统计个数的数：'))
count = 0
for i in nums:
    if n == i:
        count += 1
print(count)

实现extend的功能

list1 = ['李白', '凯', '狄仁杰']
list2 = ('老夫子', '小短腿')
for i in list2:
    list1.append(i)
print(list1)

实现index的功能

list1 = [3, 2, 5, 8, 6, 1, 9, 4, 0, 7, '大帅']
num = input('请输入0需要获取的对应下标：')
while n < len(list1):
    if num == str(list1[n]):
        print(n)
        break
    else:
        print('暂无您输入东东，列表在完善中')
        break

实现reverse的功能（不适用reverse，不产生新列表，使其反转）

list1 = ['李白', '凯', '狄仁杰', '老夫子', '小短腿', '张三']
length = len(list1)
a = 0
if length & 1 == 0:
    while a < (length / 2) + 1:
        list1[a], list1[length - 1] = list1[length - 1], list1[a]
        a += 1
        length -= 1
    print(list1)
else:
    while a < length/2:
        list1[a], list1[length-1] = list1[length-1], list1[a]
        a += 1
        length -= 1
    print(list1)