【Python基础知识】（10）List的遍历

# 遍历列表

persons = ["张三","李四","王五","赵六","钱七","孙八"]

# for循环遍历列表
# for 迭代变量 in 可迭代对象

i = 0

# 获取列表长度：len(str)

length = len(persons)

for p in persons:

    if p == "李四":

        #获取倒序下标
        ri = length * -1 + i

        print(p , i , ri)

    i += 1

# 输出：李四 1 -5


# while循环遍历列表

i = 0

while i < len(persons):

    p = persons[i]

    if p == "李四":

        # 获取倒序下标
        ri = length * -1 + i

        print(p, i, ri)

    i += 1

# 输出：李四 1 -5