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TYP: read_csv/table (names index_col) #47124

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Merged
merged 3 commits into from
Jun 3, 2022
Merged

TYP: read_csv/table (names index_col) #47124

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619c1de
TYP: read_csv/table (names, usecols, and index_col)
twoertwein May 25, 2022
22f6482
unused import
twoertwein May 26, 2022
acb9c8a
remove usecols
twoertwein May 27, 2022
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67 changes: 34 additions & 33 deletions pandas/io/parsers/readers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
IO,
Any,
Callable,
Hashable,
Literal,
NamedTuple,
Sequence,
Expand All @@ -23,11 +24,11 @@
import pandas._libs.lib as lib
from pandas._libs.parsers import STR_NA_VALUES
from pandas._typing import (
ArrayLike,
CompressionOptions,
CSVEngine,
DtypeArg,
FilePath,
IndexLabel,
ReadCsvBuffer,
StorageOptions,
)
Expand Down Expand Up @@ -521,7 +522,7 @@ def validate_integer(name, val, min_val=0):
return val


def _validate_names(names):
def _validate_names(names: Sequence[Hashable] | None) -> None:
"""
Raise ValueError if the `names` parameter contains duplicates or has an
invalid data type.
Expand Down Expand Up @@ -596,9 +597,9 @@ def read_csv(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -656,9 +657,9 @@ def read_csv(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -716,9 +717,9 @@ def read_csv(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -776,9 +777,9 @@ def read_csv(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -846,9 +847,9 @@ def read_csv(
delimiter: str | None | lib.NoDefault = None,
# Column and Index Locations and Names
header: int | Sequence[int] | None | Literal["infer"] = "infer",
names=lib.no_default,
index_col=None,
usecols=None,
names: Sequence[Hashable] | None | lib.NoDefault = lib.no_default,
index_col: IndexLabel | Literal[False] | None = None,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = None,
squeeze: bool | None = None,
prefix: str | lib.NoDefault = lib.no_default,
mangle_dupe_cols: bool = True,
Expand Down Expand Up @@ -935,9 +936,9 @@ def read_table(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -995,9 +996,9 @@ def read_table(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -1055,9 +1056,9 @@ def read_table(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -1115,9 +1116,9 @@ def read_table(
sep: str | None | lib.NoDefault = ...,
delimiter: str | None | lib.NoDefault = ...,
header: int | Sequence[int] | None | Literal["infer"] = ...,
names=...,
index_col=...,
usecols=...,
names: Sequence[Hashable] | None | lib.NoDefault = ...,
index_col: IndexLabel | Literal[False] | None = ...,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = ...,
squeeze: bool | None = ...,
prefix: str | lib.NoDefault = ...,
mangle_dupe_cols: bool = ...,
Expand Down Expand Up @@ -1185,9 +1186,9 @@ def read_table(
delimiter: str | None | lib.NoDefault = None,
# Column and Index Locations and Names
header: int | Sequence[int] | None | Literal["infer"] = "infer",
names=lib.no_default,
index_col=None,
usecols=None,
names: Sequence[Hashable] | None | lib.NoDefault = lib.no_default,
index_col: IndexLabel | Literal[False] | None = None,
usecols: Sequence[Hashable] | Callable[[Hashable], bool] | None = None,
squeeze: bool | None = None,
prefix: str | lib.NoDefault = lib.no_default,
mangle_dupe_cols: bool = True,
Expand Down Expand Up @@ -1932,7 +1933,7 @@ def _refine_defaults_read(
error_bad_lines: bool | None,
warn_bad_lines: bool | None,
on_bad_lines: str | Callable | None,
names: ArrayLike | None | lib.NoDefault,
names: Sequence[Hashable] | None | lib.NoDefault,
prefix: str | None | lib.NoDefault,
defaults: dict[str, Any],
):
Expand Down