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DuckDBPyRelation.write_{parquet, csv} lack keyword only marker in stubs #314
Description
What happens?
LSP warning for line 11 (to_csv() call):
Expected 1 positional argumentNothing for line 10 (write_csv() call).
But if I try to run it, it will crash at line 10:
Traceback (most recent call last):
File "C:\Users\tibo\python_codes\pql\t.py", line 15, in <module>
main()
~~~~^^
File "C:\Users\tibo\python_codes\pql\t.py", line 10, in main
rel.write_csv(name, sep)
~~~~~~~~~~~~~^^^^^^^^^^^
TypeError: write_csv(): incompatible function arguments. The following argument types are supported:
1. (self: _duckdb.DuckDBPyRelation, file_name: str, *, sep: object = None, na_rep: object = None, header: object = None, quotechar: object = None, escapechar: object = None, date_format: object =
None, timestamp_format: object = None, quoting: object = None, encoding: object = None, compression: object = None, overwrite: object = None, per_thread_output: object = None, use_tmp_file: object = None, partition_by: object = None, write_partition_columns: object = None) -> None
Invoked with: ┌─────────┬───────┐
│ foo │ bar │
│ varchar │ int64 │
├─────────┼───────┤
│ a │ 1 │
└─────────┴───────┘
, 'foo.csv', ','The solution would be to simply copy-past the signature from to_{csv, parquet} to their respective write_ aliases.
To Reproduce
import duckdb
import polars as pl
def main() -> None:
name = "foo.csv"
sep = ","
rel = pl.DataFrame({"foo": ["a"], "bar": [1]}).pipe(duckdb.from_arrow)
rel.write_csv(name, sep)
rel.to_csv(name, sep)
if __name__ == "__main__":
main()OS:
Windows
DuckDB Package Version:
1.4.4
Python Version:
3.13.7
Full Name:
Stettler Thibaud
Affiliation:
None
What is the latest build you tested with? If possible, we recommend testing with the latest nightly build.
I have not tested with any build
Did you include all relevant data sets for reproducing the issue?
Yes
Did you include all code required to reproduce the issue?
- Yes, I have
Did you include all relevant configuration to reproduce the issue?
- Yes, I have
Activity
[-]write_{parquet, csv} lack keyword only marker in stubs[/-][+]DuckDBPyRelation.write_{parquet, csv} lack keyword only marker in stubs[/+]evertlammerts commentedon Feb 17, 2026
Fixed in #323.
Fix multiple stub issues (#323)