python 去除list数组中的重复元素

a = "aAsmr3idd4bgs7Dlsf9eAF"
a_list = list(a)  # 转化为列表，并保存元素顺序
set_list = list(set(a_list))  # 去重
set_list.sort(key=a_list.index)
s = ''.join(set_list)
print(s)
#法二
origin=[]
for i in range(len(a)):
    if a[i] not in origin:
        origin.append(a[i])
print(''.join(origin))