cannot use playwright-python in fastapi, got NotImplementedError

[phoenixor]

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Example Code

// api.py
from playwright.async_api import async_playwright
class FS131VIAPI:
    def __init__(self):
        self.cookie = None
    async def fetch(self, params):
        await self.login_for_cookie()
        logger.info(params)

    async def login_for_cookie(self):
        async with async_playwright() as p:
            browser = await p.chromium.launch(headless=False)
            context = await browser.new_context()
            page = await context.new_page()
            await page.goto("https://cn.bing.com/")
            print(await page.title())
            print(await context.cookies())
            self.cookie = await context.cookies()
            await context.close()

// main.py
...
from api import FS131VIAPI
fs131vi_api = FS131VIAPI()
@app.post("/")
async def index():
    await fs131vi_api.fetch({"SERVICE_IDS": "xxx"})

Description

open the browser and call the endpoint '/'
fastapi received the request and call playwright-python to call "https://cn.bing.com/", return cookies

Operating System

Windows

Operating System Details

windows 10

FastAPI Version

0.85.0

Python Version

3.10.2

Additional Context

[iudeen]

It works fine. I am not able to find any issues. Below is the code I used.

import fastapi
from playwright.async_api import async_playwright

class FS131VIAPI:
    def __init__(self):
        self.cookie = None
    async def fetch(self, params):
        await self.login_for_cookie()

    async def login_for_cookie(self):
        async with async_playwright() as p:
            browser = await p.chromium.launch(headless=False)
            context = await browser.new_context()
            page = await context.new_page()
            await page.goto("https://cn.bing.com/")
            print(await page.title())
            print(await context.cookies())
            self.cookie = await context.cookies()
            await context.close()


fs131vi_api = FS131VIAPI()
app = fastapi.FastAPI()


@app.get("/")
async def index():
    await fs131vi_api.fetch({"SERVICE_IDS": "xxx"})

[NickVeld]

In order to be able to find your issue more easily could you please replace "NotEmplementedError" with "NotImplementedError"

[phoenixor]

It works fine. I am not able to find any issues. Below is the code I used.

import fastapi
from playwright.async_api import async_playwright

class FS131VIAPI:
    def __init__(self):
        self.cookie = None
    async def fetch(self, params):
        await self.login_for_cookie()

    async def login_for_cookie(self):
        async with async_playwright() as p:
            browser = await p.chromium.launch(headless=False)
            context = await browser.new_context()
            page = await context.new_page()
            await page.goto("https://cn.bing.com/")
            print(await page.title())
            print(await context.cookies())
            self.cookie = await context.cookies()
            await context.close()


fs131vi_api = FS131VIAPI()
app = fastapi.FastAPI()


@app.get("/")
async def index():
    await fs131vi_api.fetch({"SERVICE_IDS": "xxx"})

i am running on windows 10, with python 3.10.2, playwright-python 1.26.1, fastapi 0.85.0, which version did you use?

[pheman]

I get the same NotImplementedError Error using fastapi and playwright.
windows 10, python 3.10.5, fastapi=0.87.0, playwright=1.28.0

the playwright function is valid just after removing out of the fastapi api wrapper, i.e. remove "@app.get("/test")"

code attached below:

import fastapi,uvicorn
from playwright.async_api import async_playwright

class FS131VIAPI:
    def __init__(self):
        self.cookie = None
    async def fetch(self, params):
        await self.login_for_cookie()

    async def login_for_cookie(self):
        async with async_playwright() as p:
            browser = await p.chromium.launch(headless=False)
            context = await browser.new_context()
            page = await context.new_page()
            await page.goto("https://cn.bing.com/")
            print(await page.title())
            print(await context.cookies())
            self.cookie = await context.cookies()
            await context.close()


fs131vi_api = FS131VIAPI()
app = fastapi.FastAPI()


@app.get("/test")
async def index():
    await fs131vi_api.fetch({"SERVICE_IDS": "xxx"})

if __name__ == "__main__":

    uvicorn.run(
        "test:app",
        host="0.0.0.0",
        reload=True,
        port=8002
    )

[pheman]

problem can be solved by setting reload=False.
more can be found on
microsoft/playwright-python#1099

if __name__ == "__main__":

    uvicorn.run(
        "test:app",
        host="0.0.0.0",
        reload=False,
        port=8002
    )

[phoenixor]

problem can be solved by setting reload=False. more can be found on microsoft/playwright-python#1099

if __name__ == "__main__":

    uvicorn.run(
        "test:app",
        host="0.0.0.0",
        reload=False,
        port=8002
    )

i am talking about playwright-python work with reload when developing

[nick-0101]

@phoenixor did you solve this?

[jvhuaiying]

Has this problem been solved by you?

[jvhuaiying]

This problem still exists in 2024

[kaonick]

My solution is add below code before unicorn run:

asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())

[jvhuaiying]

My solution is add below code before unicorn run:

asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())

thank u very much✌️