async def wait(self):
        """
        :py:func:`asyncio.coroutine`

        Wait until can do IO
        """
        if self._limit is not None and self._limit > 0 and \
                self._start is not None:
            now = _now()
            end = self._start + self._sum / self._limit
            await asyncio.sleep(max(0, end - now))
async def wait(self):
        """
        :py:func:`asyncio.coroutine`

        Wait until can do IO
        """
        if self._limit is not None and self._limit > 0 and \
                self._start is not None:
            now = _now()
            end = self._start + self._sum / self._limit
            await asyncio.sleep(max(0, end - now))
async def wait ( self ) : if self . _limit is not None and self . _limit > 0 and self . _start is not None : now = _now ( ) end = self . _start + self . _sum / self . _limit await asyncio . sleep ( max ( 0 , end - now ) )
:py:func:`asyncio.coroutine`

        Wait until can do IO
: py : func : asyncio . coroutine