函数返回tuple怎么添加List里面（python环境下）

1、在python环境下调用函数返回tuple，将结果添加在list
list在循环前为空

2、代码如下：

result=[]
print(type(result))
for i in range(len(urllist)):
     print(i)
     add=urlget(urllist[i])
     print(type(add))
     result=result.append(add)
     print(type(result))

3、报错信息

0


1
Traceback (most recent call last):
File "C:/Users/123/PycharmProjects/urldownload/urlopentest.py", line 84, in
result=result.append(add)
AttributeError: 'NoneType' object has no attribute 'append'

result=[]
print(type(result))
for i in range(len(urllist)):
print(i)
add=urlget(urllist[i])
print(type(add))
result.append(add)
print(type(result))