运用python知识解析这些代码

Question

def my_max(seq):
max_value = None
if not isinstance(seq, (list, tuple)):
return max_value
if len(seq) == 0:
return max_value
max_value = seq[0]
for i in seq:
if not isinstance(i, (float, int)):
continue
if max_value < i:
max_value = i
return max_value

if name == "main":
lst = [3, 4, '43', 5.4]
print(my_max(lst))

Answer 1

if not isinstance(seq, (list, tuple)):判断类型是否是列表或者元组，若不是，返回None
if len(seq) == 0:判断输入数据是否为空，若为空，返回None
for i in seq: if not isinstance(i, (float, int)):循环判断类型，若不能用于比较数值大小，就进入下一次循环
if max_value < i: max_value = i更新最大值
最后返回