[Python] How to write StreamReader type to an image file in python?

url=[...]

async with aiohttp.ClientSession(headers=headerschrome) as session:
task = asyncio.create_task(fetch(session, url))

async def fetch(s, url):
async with s.request(method='GET',url=url) as r:
if r.status != 200:
r.raise_for_status()
with open('zzz/a.webp','wb') as xd:
xd.write(r.content)


xd.write(r.content)
TypeError: a bytes-like object is required, not 'StreamReader'


I receive this error when writing the response content to a file. Trying to convert StreamReader to bytes also fail with

bytes(r.content)
​

Also is there a way to append image content to a single file? Thanks a lot!

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