I have a library, littlefs-python. Using it crashes mypy. A simple example with mypy-1.9.0 and littlefs-python-0.10.0:
#!/usr/bin/python
import littlefs
class LFSStat(NamedTuple):
type: int
size: int
name: str
# Constants
TYPE_REG: int = LFS_TYPE_REG
TYPE_DIR: int = LFS_TYPE_DIR
And changing LFS_TYPE_REG & LFS_TYPE_DIR to an integer constant fixes the issue. It likely is a problem of the stub and I will report a separate bug to littlefs-python upstream, however, IMHO mypy should report this as a problem, not crash.
Traceback (most recent call last):
File "/usr/bin/mypy", line 8, in <module>
sys.exit(console_entry())
^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/__main__.py", line 15, in console_entry
main()
File "/usr/lib/python3.11/site-packages/mypy/main.py", line 100, in main
res, messages, blockers = run_build(sources, options, fscache, t0, stdout, stderr)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/main.py", line 182, in run_build
res = build.build(sources, options, None, flush_errors, fscache, stdout, stderr)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 192, in build
result = _build(
^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 266, in _build
graph = dispatch(sources, manager, stdout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 2942, in dispatch
process_graph(graph, manager)
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 3340, in process_graph
process_stale_scc(graph, scc, manager)
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 3467, in process_stale_scc
graph[id].write_cache()
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 2503, in write_cache
new_interface_hash, self.meta = write_cache(
^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/build.py", line 1564, in write_cache
data = tree.serialize()
^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/nodes.py", line 387, in serialize
"names": self.names.serialize(self._fullname),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/nodes.py", line 3933, in serialize
data[key] = value.serialize(fullname, key)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/nodes.py", line 3870, in serialize
data["node"] = self.node.serialize()
^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/nodes.py", line 3278, in serialize
"names": self.names.serialize(self.fullname),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/nodes.py", line 3933, in serialize
data[key] = value.serialize(fullname, key)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/site-packages/mypy/nodes.py", line 3865, in serialize
assert not isinstance(
AssertionError: Definition of littlefs.lfs.LFSStat.TYPE_REG is unexpectedly incomplete
See snippet above.
Crash Report
I have a library, littlefs-python. Using it crashes mypy. A simple example with
mypy-1.9.0andlittlefs-python-0.10.0:This seems to the offending definition:
And changing LFS_TYPE_REG & LFS_TYPE_DIR to an integer constant fixes the issue. It likely is a problem of the stub and I will report a separate bug to littlefs-python upstream, however, IMHO mypy should report this as a problem, not crash.
Traceback
To Reproduce
See snippet above.
Your Environment
mypy foo.py)mypy.ini(and other config files): no config present