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Fix #849: Update converters type in read_excel for better Pyright compatibility #1297

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Merged
merged 8 commits into from
Sep 19, 2025
Merged

Fix #849: Update converters type in read_excel for better Pyright compatibility #1297

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a0614f3
Add files via upload
Sachi-Parashar Jul 28, 2025
ae5365d
Add files via upload
Sachi-Parashar Jul 28, 2025
2c1b5df
Delete tests/test_excel_converters.py
Sachi-Parashar Jul 29, 2025
288c04d
Move converter test to test_io.py
Sachi-Parashar Jul 29, 2025
19d18ce
Used ensure_clean()
Sachi-Parashar Aug 7, 2025
9f07189
Update test_io.py black formatting
loicdiridollou Sep 19, 2025
ce290e1
Update test_io.py
loicdiridollou Sep 19, 2025
5128059
Update test_io.py
loicdiridollou Sep 19, 2025
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12 changes: 6 additions & 6 deletions pandas-stubs/io/excel/_base.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@ def read_excel(
usecols: str | UsecolsArgType = ...,
dtype: str | Dtype | Mapping[str, str | Dtype] | None = ...,
engine: ExcelReadEngine | None = ...,
converters: Mapping[int | str, Callable[[object], object]] | None = ...,
converters: Mapping[int | str, Callable[[Any], Any]] | None = ...,
true_values: Iterable[Hashable] | None = ...,
false_values: Iterable[Hashable] | None = ...,
skiprows: int | Sequence[int] | Callable[[object], bool] | None = ...,
Expand Down Expand Up @@ -97,7 +97,7 @@ def read_excel(
usecols: str | UsecolsArgType = ...,
dtype: str | Dtype | Mapping[str, str | Dtype] | None = ...,
engine: ExcelReadEngine | None = ...,
converters: Mapping[int | str, Callable[[object], object]] | None = ...,
converters: Mapping[int | str, Callable[[Any], Any]] | None = ...,
true_values: Iterable[Hashable] | None = ...,
false_values: Iterable[Hashable] | None = ...,
skiprows: int | Sequence[int] | Callable[[object], bool] | None = ...,
Expand Down Expand Up @@ -141,7 +141,7 @@ def read_excel( # type: ignore[overload-cannot-match]
usecols: str | UsecolsArgType = ...,
dtype: str | Dtype | Mapping[str, str | Dtype] | None = ...,
engine: ExcelReadEngine | None = ...,
converters: Mapping[int | str, Callable[[object], object]] | None = ...,
converters: Mapping[int | str, Callable[[Any], Any]] | None = ...,
true_values: Iterable[Hashable] | None = ...,
false_values: Iterable[Hashable] | None = ...,
skiprows: int | Sequence[int] | Callable[[object], bool] | None = ...,
Expand Down Expand Up @@ -184,7 +184,7 @@ def read_excel(
usecols: str | UsecolsArgType = ...,
dtype: str | Dtype | Mapping[str, str | Dtype] | None = ...,
engine: ExcelReadEngine | None = ...,
converters: Mapping[int | str, Callable[[object], object]] | None = ...,
converters: Mapping[int | str, Callable[[Any], Any]] | None = ...,
true_values: Iterable[Hashable] | None = ...,
false_values: Iterable[Hashable] | None = ...,
skiprows: int | Sequence[int] | Callable[[object], bool] | None = ...,
Expand Down Expand Up @@ -264,7 +264,7 @@ class ExcelFile:
names: ListLikeHashable | None = ...,
index_col: int | Sequence[int] | None = ...,
usecols: str | UsecolsArgType = ...,
converters: dict[int | str, Callable[[object], object]] | None = ...,
converters: dict[int | str, Callable[[Any], Any]] | None = ...,
true_values: Iterable[Hashable] | None = ...,
false_values: Iterable[Hashable] | None = ...,
skiprows: int | Sequence[int] | Callable[[object], bool] | None = ...,
Expand Down Expand Up @@ -292,7 +292,7 @@ class ExcelFile:
names: ListLikeHashable | None = ...,
index_col: int | Sequence[int] | None = ...,
usecols: str | UsecolsArgType = ...,
converters: dict[int | str, Callable[[object], object]] | None = ...,
converters: dict[int | str, Callable[[Any], Any]] | None = ...,
true_values: Iterable[Hashable] | None = ...,
false_values: Iterable[Hashable] | None = ...,
skiprows: int | Sequence[int] | Callable[[object], bool] | None = ...,
Expand Down
12 changes: 12 additions & 0 deletions tests/test_io.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
from collections import defaultdict
from collections.abc import Generator
import csv
from functools import partial
import io
import os.path
import pathlib
Expand Down Expand Up @@ -1792,3 +1793,14 @@ def test_read_json_engine() -> None:
pd.read_json(dd, lines=False, engine="pyarrow") # type: ignore[call-overload] # pyright: ignore[reportArgumentType, reportCallIssue]
pd.read_json(io.StringIO(data), engine="pyarrow") # type: ignore[call-overload] # pyright: ignore[reportArgumentType]
pd.read_json(io.StringIO(data), lines=True, engine="pyarrow") # type: ignore[call-overload] # pyright: ignore[reportArgumentType, reportCallIssue]


def test_converters_partial() -> None:
df = pd.DataFrame({"field_1": ["2020-01-01", "not a date"]})
partial_func = partial(pd.to_datetime, errors="coerce")

with ensure_clean(".xlsx") as path:
check(assert_type(df.to_excel(path, index=False), None), type(None))

result = pd.read_excel(path, converters={"field_1": partial_func})
check(assert_type(result, pd.DataFrame), pd.DataFrame)
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