wait_for(predicate, timeout=None) Wait until a condition evaluates to True. predicate should be a callable which result

_callmethod(methodname[, args[, kwds]]) Call and return the result of a method of the proxy’s referent. If

class concurrent.futures.ProcessPoolExecutor(max_workers=None) An Executor subclass that executes calls asynchronously

release() Release a semaphore, incrementing the internal counter by one. When it was zero on entry and another thread is waiting

Popen.poll() Check if child process has terminated. Set and return returncode attribute.

clear() Reset the internal flag to false. Subsequently, threads calling wait() will block until set()

exception multiprocessing.BufferTooShort Exception raised by Connection.recv_bytes_into() when the supplied buffer

Popen.args The args argument as it was passed to Popen – a sequence of program arguments or else a single

exitcode The child’s exit code. This will be None if the process has not yet terminated. A negative value -N

exception multiprocessing.AuthenticationError Raised when there is an authentication error.