python初学者必须会的四种算法

1交换变量

a, b =b, a

2计算最值

# 定义函数,在数字列表中获取最小值
list01=[20,4,6,7,3,9,4]
def get_min_num(list_num):
    min_num=list_num[0]
    for num in list_num:
        if min_num >num:
            min_num=num
    return min_num
print(get_min_num(list01))

3累计运算

# 4. 将列表中的数字累减
#     list02 = [5, 1, 4, 6, 7, 4, 6, 8, 5]

list02 = [5, 1, 4, 6, 7, 4, 6, 8, 5]


num = list02[0]
for item in range(1,len(list02)):
    num-=list02[item]
print(num)

4排序

# 定义函数,对数字列表进行升序排列
list01=[20,4,6,7,3,9,4]
def sort_num(list_num):
    for i in range(len(list_num)):
        for m in range(i+1,len(list_num)):
            if list_num[i]>list_num[m]:
                list_num[i],list_num[m]=list_num[m],list_num[i]
    return list_num
sort_num(list01)
print(list01)