Method start

Lib/threading.py:975–1011

Start the thread's activity. It must be called at most once per thread object. It arranges for the object's run() method to be invoked in a separate thread of control. This method will raise a RuntimeError if called more than once on the same thread object.

(self)

        return "<%s(%s, %s)>" % (self.__class__.__name__, self._name, status)

    def start(self):
        """Start the thread&#x27;s activity.

        It must be called at most once per thread object. It arranges for the
        object&#x27;s run() method to be invoked in a separate thread of control.

        This method will raise a RuntimeError if called more than once on the
        same thread object.

        """
        if not self._initialized:
            raise RuntimeError("thread.__init__() not called")

        if self._started.is_set():
            raise RuntimeError("threads can only be started once")

        with _active_limbo_lock:
            _limbo[self] = self

        if self._context is None:
            # No context provided
            if _sys.flags.thread_inherit_context:
                # start with a copy of the context of the caller
                self._context = _contextvars.copy_context()
            else:
                # start with an empty context
                self._context = _contextvars.Context()

        try:
            # Start joinable thread
            _start_joinable_thread(self._bootstrap, handle=self._os_thread_handle,
                                   daemon=self.daemon)
        except Exception:
            with _active_limbo_lock:
                del _limbo[self]
            raise
        self._started.wait()  # Will set ident and native_id

    def run(self):
        """Method representing the thread&#x27;s activity.