kiri11
commented
3 months ago Maybe just increase the recursion limit? Is it currently the default 1000? You can check with sys.getrecursionlimit() and increase with sys.setrecursionlimit
Open sirosen opened 4 months ago
kiri11
commented
3 months ago Maybe just increase the recursion limit? Is it currently the default 1000? You can check with sys.getrecursionlimit() and increase with sys.setrecursionlimit
sirosen
commented
3 months ago That probably works if my goal is to make this work by hook or by crook. I opened this primarily because it was an interesting discovery I felt was worth sharing with the libcst maintainers. It's not really blocking me from any work. (I would not be bothered if libcst declares this a non-issue and closes.)
Running a simple roundtripper on every python file in the cpython repo's
Libdir found this interesting case. Aside: this is the only new case I found in my follow-up investigation from #1095.Here's a permalink to the current version of
pydoc_data/topics.pyAttempting to roundtrip this file in my scratch env produces a huge trace of the form:
long trace (with sections snipped)
``` Traceback (most recent call last): File "/home/sirosen/_scratch/.venv/lib/python3.11/site-packages/libcst/_nodes/base.py", line 358, in deep_clone cloned_fields[key] = tuple(_clone(v) for v in val) ^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: 'Dict' object is not iterable During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/sirosen/_scratch/.venv/lib/python3.11/site-packages/libcst/_nodes/base.py", line 358, in deep_clone cloned_fields[key] = tuple(_clone(v) for v in val) ^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: 'ConcatenatedString' object is not iterable During handling of the above exception, another exception occurred: ... repeats many times ... During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/sirosen/_scratch/.venv/lib/python3.11/site-packages/libcst/_nodes/base.py", line 358, in deep_clone cloned_fields[key] = tuple(_clone(v) for v in val) ^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: 'ConcatenatedString' object is not iterable During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/sirosen/_scratch/.venv/lib/python3.11/site-packages/libcst/_nodes/base.py", line 358, in deep_clone cloned_fields[key] = tuple(_clone(v) for v in val) ^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: 'SimpleString' object is not iterable During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/sirosen/_scratch/rt.py", line 21, inIn case it's relevant, my no-op transformer is this body of code:
rt.py
```python import sys import libcst class NoopTransformer(libcst.CSTTransformer): pass def _roundtrip_data(content: bytes) -> bytes: raw_tree = libcst.parse_module(content) wrapped_tree = libcst.MetadataWrapper(raw_tree) tree = wrapped_tree.visit(NoopTransformer()) return tree.code.encode(tree.encoding) fn = sys.argv[1] with open(fn, "rb") as fp: content = fp.read() _roundtrip_data(content) ```My guess would be that this is hard to solve because it probably requires unwinding a complex recursive construction into something non-recursive. Given that cpython can support this, I thought it was interesting enough to be worth reporting.