Passing a list of tuples with an optional parameter works with 1 multiplier, not 2
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bug
topic-type-context
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
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Description
Bug Report
(A clear and concise description of what the bug is.)
To Reproduce
from typing import List, Optional, Tuple
def take_list(the_list: List[Tuple[Optional[int], int]]):
print(the_list)
take_list([(None, 1)]*12) # no error
take_list([(None, 1)]*12*8) # error
take_list([(None, 1)]*(12*8)) # no error
assert [(None, 1)]*12*8 == [(None, 1)]*(12*8) # passes
Expected Behavior
I expect the second function call to not raise an error.
Actual Behavior
The second function call does raise an error.
Your Environment
- Mypy version used: mypy==1.4.1
- Mypy command-line flags: none
- Mypy configuration options from
mypy.ini(and other config files):
# Global options:
[mypy]
warn_return_any = True
warn_unused_configs = True
check_untyped_defs = True
# Per-module options:
[mypy-usb.*]
ignore_missing_imports = True
[mypy-ot_api.*]
ignore_missing_imports = True
[mypy-pylibftdi.*]
ignore_missing_imports = True
- Python version used: 3.10.12
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 the provided example with mypy 1.4.1 and confirm the differing results for list multiplication. Trace the type checking of the two function calls and locate the relevant regression-test area in the repository. Done means the second call is accepted consistently with the parenthesized form, with a test covering the behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers, devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 35/100