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Missing type hints for matplotlib.dates.DateFormatter #29994
Description
Using this code:
from matplotlib.dates import DateFormatter
date_fmt = "%H:%M:%S"
date_formatter = DateFormatter(date_fmt)Running Mypy in strict mode results in an erorr:
$ mypy --strict main.py
main.py:4: error: Call to untyped function "DateFormatter" in typed context [no-untyped-call]
Found 1 error in 1 file (checked 1 source file)
We run Mypy in strict mode across all of our code base to catch programming errors and would like to use it with matplotlib without the need to suppress errors like this.
Environment
- Python 3.11.11
- matplotlib 3.10.1
- mypy 1.15.0
Activity
johnthagen commentedon May 1, 2025
This looks to be the constructor that is missing type annotations
matplotlib/lib/matplotlib/dates.py
Line 573 in 6378dd0
oscargus commentedon May 1, 2025
The
datesmodule is currently completely untyped. Matplotlib uses stub-files,.pyiin case you or someone else wants to start adding type information.bandpooja commentedon Jun 1, 2025
Added type hints in #30126.
rcomer commentedon Aug 4, 2025
Closing this one as a duplicate of #26942