[python][twisted] how defer works

twisted inlineCallbacks

from twisted.internet.defer import inlineCallbacks
from twisted.internet.defer import Deferred
from twisted.internet import defer


@inlineCallbacks
def got():
    x = yield 'k22'
    defer.returnValue(x)


@inlineCallbacks
def run():
    print("in run")
    result = yield got()
    print("after yield")
    # print(next(result))
    print("in run's result: {0}".format(result))
    defer.returnValue("return 42")


if __name__ == "__main__":
    print("Start in main")
    result = run()
    print("End after run")
    print("Result: {0}".format(result))
    print(result.result)