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asyncio python

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Naughty Newt answered on February 4, 2021 Popularity 10/10 Helpfulness 4/10

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related python async await

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asyncio python

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import asyncio

async def print_B_and_D():
    print('B')
    await asyncio.sleep(1)
    return 'D'

async def main_def():
    print("A")
    first = asyncio.create_task(print_B_and_D())
    await asyncio.sleep(2)
    print("C")
    print(await first)

asyncio.run(main_def())

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: python

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Contributed on Dec 16 2022

Naughty Newt

0 Answers Avg Quality 2/10

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python async await

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import asyncio

async def print_B(): #Simple async def
    print("B")

async def main_def():
    print("A")
    await asyncio.gather(print_B())
    print("C")
asyncio.run(main_def())

# The function you wait for must include async
# The function you use await must include async
# The function you use await must run by asyncio.run(THE_FUNC())

Popularity 10/10 Helpfulness 5/10 Language python

Source: Grepper

Tags: async-await asyn

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Contributed on Feb 04 2021

The Biton

0 Answers Avg Quality 2/10

async python

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Read this blog post:
https://medium.com/dev-genius/asynchronous-programming-in-python-with-async-functions-and-asyncio-ba673a4abab6

Popularity 8/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: python

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Contributed on Feb 09 2024

Wide-eyed Worm

0 Answers Avg Quality 2/10

async python

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import asyncio

async def main():
    print('Hello ...')
    await asyncio.sleep(1)
    print('... World!')

asyncio.run(main())

Popularity 8/10 Helpfulness 4/10 Language python

Source: docs.python.org

Tags: python

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Contributed on May 12 2022

needslyp

0 Answers Avg Quality 2/10

async, await, python

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async def get_chat_id(name):
    await asyncio.sleep(3)
    return "chat-%s" % name

async def main():
    id_coroutine = get_chat_id("django")
    result = await id_coroutine

Popularity 10/10 Helpfulness 3/10 Language python

Source: www.aeracode.org

Tags: python py

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Contributed on Aug 16 2021

Tense Thrush

0 Answers Avg Quality 2/10

python async await

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import asyncio
from PIL import Image
import urllib.request as urllib2

async def getPic(): #Proof of async def
    pic = Image.open(urllib2.urlopen("https://c.files.bbci.co.uk/E9DF/production/_96317895_gettyimages-164067218.jpg"))
    return pic

async def main_def():
    print("A")
    print("Must await before get pic0...")
    pic0 = await asyncio.gather(getPic())
    print(pic0)
asyncio.run(main_def())

Popularity 10/10 Helpfulness 3/10 Language python

Source: Grepper

Tags: async-await asyn

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Contributed on Feb 04 2021

The Biton

0 Answers Avg Quality 2/10

python async

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# Import necessary modules
import asyncio
import json
import ssl
import upstox_client
import websockets
from google.protobuf.json_format import MessageToDict
from pprint import pprint
import MarketDataFeed_pb2 as pb
from cs50 import SQL


# Configure CS50 Library to use SQLite database
db = SQL("sqlite:///finance.db")

def get_market_data_feed_authorize(api_version, configuration):
    """Get authorization for market data feed."""
    api_instance = upstox_client.WebsocketApi(
        upstox_client.ApiClient(configuration))
    api_response = api_instance.get_market_data_feed_authorize(api_version)
    return api_response


def decode_protobuf(buffer):
    """Decode protobuf message."""
    feed_response = pb.FeedResponse()
    feed_response.ParseFromString(buffer)
    return feed_response


async def fetch_market_data(subscribe_instruments):
    """Fetch market data using WebSocket and print it."""

    # Create default SSL context
    ssl_context = ssl.create_default_context()
    ssl_context.check_hostname = False
    ssl_context.verify_mode = ssl.CERT_NONE

    # Configure OAuth2 access token for authorization

    API_VERSION = "2.0"
    # Get market data feed authorization
    configuration = upstox_client.Configuration()
    ACCESS_TOKEN = db.execute("SELECT ACCESS_TOKEN FROM credentials WHERE CLIENT_ID = 1")[0]["ACCESS_TOKEN"]
    configuration.access_token = ACCESS_TOKEN

    response = get_market_data_feed_authorize(API_VERSION, configuration)

    # Connect to the WebSocket with SSL context
    async with websockets.connect(response.data.authorized_redirect_uri, ssl=ssl_context) as websocket:
        print('Connection established')

        await asyncio.sleep(1)  # Wait for 1 second

        await subscribe_to_instruments(websocket, subscribe_instruments)

        # Continuously receive and decode data from WebSocket
        try:
            while True:
                message = await websocket.recv()
                decoded_data = decode_protobuf(message)

                # Convert the decoded data to a dictionary
                data_dict = MessageToDict(decoded_data)

                # Print the dictionary representation
                print(json.dumps(data_dict))
                #ltp_value = data_dict['feeds']['NSE_INDEX|Nifty 50']['ltpc']['ltp']
                #print(ltp_value)
        except asyncio.CancelledError:
            # Perform cleanup or termination tasks here
            print("WebSocket connection is being gracefully shutdown.")
            await websocket.close()

async def subscribe_to_instruments(websocket, instruments):
    """Subscribe to a list of instruments."""
    data = {
        "guid": "someguid",
        "method": "sub",
        "data": {
            "mode": 'ltpc',
            "instrumentKeys": instruments
        }
    }

    # Convert data to binary and send over WebSocket
    binary_data = json.dumps(data).encode('utf-8')
    await websocket.send(binary_data)

async def update_subscription(websocket, new_instruments):
    """Update the subscription to a new list of instruments."""
    await websocket.send(json.dumps({"method": "unsub"}).encode('utf-8'))
    await asyncio.sleep(1)  # Wait for the unsubscription to take effect
    await subscribe_to_instruments(websocket, new_instruments)

async def main():
    subscribe_instruments = ['NSE_INDEX|Nifty 50']
    await fetch_market_data(subscribe_instruments)
    
    await asyncio.sleep(10)
    # # # Dynamically update subscription to new instruments
    new_subscribe_instruments = ['NSE_INDEX|Nifty Bank']
    await update_subscription(websocket, new_subscribe_instruments)

if __name__ == "__main__":
    # Execute the function to fetch market data
    asyncio.run(main())

Popularity 7/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: python

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Contributed on Jan 29 2024

Vasu Devan

0 Answers Avg Quality 2/10

asyncio python

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