twisted example

callbacks.py

from twisted.internet import reactor, defer
from twisted.web.client import Agent


def ping_google():
    agent = Agent(reactor)
    d = agent.request("GET", "https://www.google.com/")

    def check(response):
        print("finish request")
        return response.code == 200

    d.addCallback(check)

    return d


@defer.inlineCallbacks
def main():
    is_ok = yield ping_google()
    if is_ok:
        print("Google is ok")
    else:
        print("Google is down")
    reactor.stop()


if __name__ == "__main__":
    reactor.callLater(0, main)
    reactor.run()

inline.py

from twisted.internet import reactor, defer
from twisted.web.client import Agent


@defer.inlineCallbacks
def ping_google():
    agent = Agent(reactor)
    
    response = yield agent.request("GET", "https://www.google.com/")
    
    print("finish request")
    defer.returnValue(response.code == 200)


@defer.inlineCallbacks
def main():
    is_ok = yield ping_google()
    if is_ok:
        print("Google is ok")
    else:
        print("Google is down")
    reactor.stop()


if __name__ == "__main__":
    reactor.callLater(0, main)
    reactor.run()