IronLanguages / IronLanguages/ironpython3
generator does not free resources after iteration
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- C#
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Description
For example:
import gc
import weakref
class qwerty:
def __iter__(self):
yield
a = qwerty()
r = weakref.ref(a)
i = iter(a)
a = list(i) # consumes the generator and clears the reference
gc.collect() # probably required for IronPython
assert r() is None
Causes a failure in test_userlist (test_free_after_iterating) from CPython 3.5.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running test_userlist, specifically test_free_after_iterating, and reproduce the weakref example from the issue. Trace the generator's lifetime after list(i) consumes it and compare the result with CPython 3.5; done means the weak reference is cleared and the test passes, including after gc.collect().
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100