Dmypy crashes when adding import and rechecking
Open
Nobody has claimed this yet.
crash
topic-daemon
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
Crash Report
Daemon crashes after adding an import flask statement and re-checking.
Traceback
Daemon crashed!
Traceback (most recent call last):
File "mypy/dmypy_server.py", line 221, in serve
File "mypy/dmypy_server.py", line 264, in run_command
File "mypy/dmypy_server.py", line 323, in cmd_run
File "mypy/dmypy_server.py", line 385, in check
File "mypy/dmypy_server.py", line 564, in fine_grained_increment_follow_imports
File "mypy/dmypy_server.py", line 679, in find_reachable_changed_modules
KeyError: 'jinja2'
To Reproduce
mkdir test && cd test
touch hi.py
dmypy run -- . # works
echo "import flask" > hi.py
dmypy run -- . # crashes
dmypy run -- . # works
Note that flask is not installed.
Your Environment
- Mypy version used: 0.800
- Mypy command-line flags:
dmypy run -- . - Mypy configuration options from
mypy.ini(and other config files): none - Python version used: 3.9.1
- Operating system and version: macOS 10.15.7
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 with mypy/dmypy_server.py and follow cmd_run, check, fine_grained_increment_follow_imports, and find_reachable_changed_modules using the provided reproduction. Investigate the missing 'jinja2' lookup after adding an unavailable flask import; done means the repeated dmypy run no longer crashes.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100