Method wait_for

Lib/asyncio/locks.py:303–315

Wait until a predicate becomes true. The predicate should be a callable whose result will be interpreted as a boolean value. The method will repeatedly wait() until it evaluates to true. The final predicate value is the return value.

(self, predicate)

            raise

    async def wait_for(self, predicate):
        """Wait until a predicate becomes true.

        The predicate should be a callable whose result will be
        interpreted as a boolean value.  The method will repeatedly
        wait() until it evaluates to true.  The final predicate value is
        the return value.
        """
        result = predicate()
        while not result:
            await self.wait()
            result = predicate()
        return result

    def notify(self, n=1):
        """By default, wake up one task waiting on this condition, if any.