Exception stacktrace generated from passing an invalid `target` to `Thread(...).start()` does not include the line calling the `start()` method

import threading,sys
print(sys.version)
def ThreadMain():
    print("howdy cowboy")
ThreadMaiin=True

myThread=threading.Thread(target=ThreadMaiin)
myThread.start() # @note Ideally, the Stacktrace generated by the exception raised as a result of this line would include the line itself

Prints the following to console:

3.14.3 (tags/v3.14.3:323c59a, Feb  3 2026, 16:04:56) [MSC v.1944 64 bit (AMD64)]
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\olliv\AppData\Local\Programs\Python\Python314\Lib\threading.py", line 1082, in _bootstrap_inner
    self._context.run(self.run)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "C:\Users\olliv\AppData\Local\Programs\Python\Python314\Lib\threading.py", line 1024, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'bool' object is not callable

Linked PRs

• gh-145243

從 threading.py 開始，特別檢查 Thread.start()、_bootstrap_inner() 和 run()，並在進行變更前查看 gh-145243 中的相關工作。重現無效目標範例，並追蹤 worker 例外的格式化方式；完成的標準是 traceback 包含呼叫者的 myThread.start() 行，同時不影響正常的執行緒例外報告。