python3合并list并去重

最简单的是遍历，就不赘述了。下面介绍转成set 方法

转成 set

product_id_list = ['10047', '8156', '10788', '12']
current = ['1', '200', '10047', '34']
product_id_list.extend(current)

print(','.join(set(product_id_list)))

# 也可以这样写
product_ids = ','.join((item) for item in set(product_id_list))
print(product_ids)