Python objects life cycle tracing

Question

Is there any way to trace life cycle of objects during python code running? I know about sys.settrace function for setting callback, I can stop on each function call or line of code, but how can I get access to "living" objects during this? I would like to trace program so that I can do random checks after each stop, as if I really added code at stop place in sources.

Not sure what you are trying to achieve here. What kind of information are you trying to gather? — Martijn Pieters
– Martijn Pieters, Commented Jan 12, 2013 at 12:42
For example, at this step execution of program passed to func func1 and 1 line allready runned in which object obj1 of some type was created. I want to check this obj1, for example get results from dir(obj1) or check class of obj1 — exbluesbreaker
– exbluesbreaker, Commented Jan 12, 2013 at 12:49
And you cannot do that with import pdb; pdb.set_trace()? That gives you an interactive debugger at that point. Object creation is itself not traceable, put traces in their __init__ or __new__ functions itself. — Martijn Pieters
– Martijn Pieters, Commented Jan 12, 2013 at 12:56
I want to trace program without modification of source code. I realized that i must add pdb.set_trace() to all functions in program, which i am tracing. Also i am interesting not in interactive tracing, i want to write code which extract needed data during execution. — exbluesbreaker
– exbluesbreaker, Commented Jan 12, 2013 at 13:56

Community · Accepted Answer · 2017-05-23 10:29:50Z

2

Up to some extend can be done by gc (garbage collector) module in CPython.

Garbage Collector There are few functions using object as parameter and can provide some information regarding object existence:

gc.get_referrers(*objs)
gc.get_referents(*objs)
gc.is_tracked(obj)

To simply check if object exists use 'try' as described here

edited May 23, 2017 at 10:29

CommunityBot

11 silver badge

answered Jan 14, 2014 at 16:51

asf las

1312 silver badges5 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Ganesh Sittampalam Over a year ago

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes.

asf las Over a year ago

The link was given to python documentation. Actually it would be better for me to comment on OP question but i don't have rights yet to do that. I will paste some information from link.

Collectives™ on Stack Overflow

Python objects life cycle tracing

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related