>>> import threading
>>> thread = threading.Thread(target=lambda: threading.current_thread().name == 'MainThread')
>>> thread.run()
>>> thread.join()
Traceback (most recent call last):
  File "<python-input-3>", line 1, in <module>
    thread.join()
    ~~~~~~~~~~~^^
  File "/Users/codyscott_1/.pyenv/versions/3.13t-dev/lib/python3.13t/threading.py", line 1083, in join
    raise RuntimeError("cannot join thread before it is started")
RuntimeError: cannot join thread before it is started
>>> thread.start()
Exception in thread Thread-1 (<lambda>):
>>> Traceback (most recent call last):
                                        File "/Users/codyscott_1/.pyenv/versions/3.13t-dev/lib/python3.13t/threading.py", line 991, in run
                                                                if self._target is not None:
                     ^^^^^^^^^^^^
                                 AttributeError: 'Thread' object has no attribute '_target'. Did you mean: '_started'?

                                        During handling of the above exception, another exception occurred:

                             Traceback (most recent call last):
                                                                 File "/Users/codyscott_1/.pyenv/versions/3.13t-dev/lib/python3.13t/threading.py", line 1041, in _bootstrap_inner
                         self.run()
                                       ~~~~~~~~^^
                                                   File "/Users/codyscott_1/.pyenv/versions/3.13t-dev/lib/python3.13t/threading.py", line 996, in run
                                                                           del self._target, self._args, self._kwargs
                                               ^^^^^^^^^^^^
                                                           AttributeError: 'Thread' object has no attribute '_target'

>>>