Hi, Any new scope entered or exited could be traced by defining a custom tracing function and setting it using the sys <https://docs.python.org/3/library/sys.html> module through sys.settrace() <https://docs.python.org/3/library/sys.html#sys.settrace> or sys.setprofile() <https://docs.python.org/3/library/sys.html#sys.setprofile>. This is also true for multithreaded applications using the threading <https://docs.python.org/3/library/threading.html> module. Thus, it is rather vague whether the __enter__() and __exit__() functions executed by a with statement could be traced, and if so, in what cases. For instance, _thread.LockType or simply primitive lock objects from threading being used with the context management (i.e. with statement) might not allow us to trace a lock being acquired or released. In other words whether the __enter__() function that calls acquire() is called. After some experimentation, unfortunately this is not the case if either Python or C functions (for CPython) are traced. So the question whether with-statements could be traced by the python interpreter ought to be clearly stated since in some cases it works and in some doesn't. _____________________________________________________________________________ *EXAMPLE:* import threading import sys def tracer(frame, event, arg): if event == 'call': print(f"Entering: {frame.f_code.co_name}") return tracer elif event == 'c_call': print(f"C --- Entering: {arg.__name__}") elif event == 'return': print(f"Returning: {arg!r}") elif event == 'c_return': print(f"C --- Returning from: {arg.__name__}") lock = threading.Lock() sys.setprofile(tracer) threading.setprofile(tracer) print("Begin...") # In the following case, we would see the C functions # being called: acquire and release lock.acquire() print("Do some routine with explicit locking") lock.release() print("In the middle...") # In the following case, we cannot see that any locking is happening, # nor if the __enter__() and __exit__() methods called with lock: print("Do some routine with locking using context management") print("End...") _______________________________________________________________________________________ Best, Mohamad