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Class Index (1.24.0) | Python client library

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Index(data=None, dtype=None, *, name=None, session=None)

Immutable sequence used for indexing and alignment.

The basic object storing axis labels for all objects.

Properties T

Return the transpose, which is by definition self.

dtype

Return the dtype object of the underlying data.

dtypes

Return the dtypes as a Series for the underlying MultiIndex.

empty

Returns True if the Index is empty, otherwise returns False.

has_duplicates

Check if the Index has duplicate values.

is_monotonic_decreasing

Return a boolean if the values are equal or decreasing.

is_monotonic_increasing

Return a boolean if the values are equal or increasing.

is_unique

Return if the index has unique values.

name

Returns Index name.

names

Returns the names of the Index.

ndim

API documentation for ndim property.

nlevels

Number of levels.

query_job

BigQuery job metadata for the most recent query.

shape

Return a tuple of the shape of the underlying data.

size

Returns the size of the Index.

values

Return an array representing the data in the Index.

Methods all

Return whether all elements are Truthy.

Returns Type Description bool A single element array-like may be converted to bool. any

Return whether any element is Truthy.

Returns Type Description bool A single element array-like may be converted to bool. argmax

Return int position of the largest value in the Series.

If the maximum is achieved in multiple locations, the first row position is returned.

Returns Type Description int Row position of the maximum value. argmin

Return int position of the smallest value in the series.

If the minimum is achieved in multiple locations, the first row position is returned.

Returns Type Description int Row position of the minimum value. astype
astype(
    dtype: typing.Union[
        typing.Literal[
            "boolean",
            "Float64",
            "Int64",
            "int64[pyarrow]",
            "string",
            "string[pyarrow]",
            "timestamp[us, tz=UTC][pyarrow]",
            "timestamp[us][pyarrow]",
            "date32[day][pyarrow]",
            "time64[us][pyarrow]",
            "decimal128(38, 9)[pyarrow]",
            "decimal256(76, 38)[pyarrow]",
            "binary[pyarrow]",
        ],
        pandas.core.arrays.boolean.BooleanDtype,
        pandas.core.arrays.floating.Float64Dtype,
        pandas.core.arrays.integer.Int64Dtype,
        pandas.core.arrays.string_.StringDtype,
        pandas.core.dtypes.dtypes.ArrowDtype,
        geopandas.array.GeometryDtype,
    ]
) -> bigframes.core.indexes.base.Index

Create an Index with values cast to dtypes.

The class of a new Index is determined by dtype. When conversion is impossible, a TypeError exception is raised.

Returns Type Description Index Index with values cast to specified dtype. copy
copy(name: typing.Optional[typing.Hashable] = None)

Make a copy of this object.

Name is set on the new object.

Parameter Name Description name Label, optional

Set name for new object.

Returns Type Description Index Index reference to new object, which is a copy of this object. drop
drop(labels: typing.Any) -> bigframes.core.indexes.base.Index

Make new Index with passed list of labels deleted.

Returns Type Description Index Will be same type as self. drop_duplicates
drop_duplicates(*, keep: str = "first") -> bigframes.core.indexes.base.Index

Return Index with duplicate values removed.

Parameter Name Description keep {'first', 'last', False}, default 'first'

One of: 'first' : Drop duplicates except for the first occurrence. 'last' : Drop duplicates except for the last occurrence. False : Drop all duplicates.

dropna
dropna(
    how: typing.Literal["all", "any"] = "any"
) -> bigframes.core.indexes.base.Index

Return Index without NA/NaN values.

Parameter Name Description how {'any', 'all'}, default 'any'

If the Index is a MultiIndex, drop the value when any or all levels are NaN.

fillna
fillna(value=None) -> bigframes.core.indexes.base.Index

Fill NA/NaN values with the specified value.

Parameter Name Description value scalar

Scalar value to use to fill holes (e.g. 0). This value cannot be a list-likes.

from_frame
from_frame(
    frame: typing.Union[bigframes.series.Series, bigframes.dataframe.DataFrame]
) -> bigframes.core.indexes.base.Index

API documentation for from_frame method.

get_level_values
get_level_values(level) -> bigframes.core.indexes.base.Index

Return an Index of values for requested level.

This is primarily useful to get an individual level of values from a MultiIndex, but is provided on Index as well for compatibility.

Parameter Name Description level int or str

It is either the integer position or the name of the level.

Returns Type Description Index Calling object, as there is only one level in the Index. isin
isin(values) -> bigframes.core.indexes.base.Index

Return a boolean array where the index values are in values.

Compute boolean array to check whether each index value is found in the passed set of values. The length of the returned boolean array matches the length of the index.

Parameter Name Description values set or list-like

Sought values.

Returns Type Description Series Series of boolean values. max

Return the maximum value of the Index.

Returns Type Description scalar Maximum value. min

Return the minimum value of the Index.

Returns Type Description scalar Minimum value. nunique

Return number of unique elements in the object.

Excludes NA values by default.

rename
rename(
    name: typing.Union[str, typing.Sequence[str]]
) -> bigframes.core.indexes.base.Index

Alter Index or MultiIndex name.

Able to set new names without level. Defaults to returning new index. Length of names must match number of levels in MultiIndex.

Parameter Name Description name label or list of labels

Name(s) to set.

Returns Type Description Index The same type as the caller. sort_values
sort_values(*, ascending: bool = True, na_position: str = "last")

Return a sorted copy of the index.

Return a sorted copy of the index, and optionally return the indices that sorted the index itself.

Parameters Name Description ascending bool, default True

Should the index values be sorted in an ascending order.

na_position {'first' or 'last'}, default 'last'

Argument 'first' puts NaNs at the beginning, 'last' puts NaNs at the end.

Returns Type Description pandas.Index Sorted copy of the index. to_numpy
to_numpy(dtype=None, **kwargs) -> numpy.ndarray

A NumPy ndarray representing the values in this Series or Index.

to_pandas
to_pandas() -> pandas.core.indexes.base.Index

Gets the Index as a pandas Index.

Returns Type Description pandas.Index A pandas Index with all of the labels from this Index. to_series
to_series(
    index: typing.Optional[bigframes.core.indexes.base.Index] = None,
    name: typing.Optional[typing.Hashable] = None,
) -> bigframes.series.Series

Create a Series with both index and values equal to the index keys.

Useful with map for returning an indexer based on an index.

Parameters Name Description index Index, optional

Index of resulting Series. If None, defaults to original index.

name str, optional

Name of resulting Series. If None, defaults to name of original index.

Returns Type Description Series The dtype will be based on the type of the Index values. transpose
transpose() -> bigframes.core.indexes.base.Index

Return the transpose, which is by definition self.

value_counts
value_counts(
    normalize: bool = False,
    sort: bool = True,
    ascending: bool = False,
    *,
    dropna: bool = True
)

Return a Series containing counts of unique values.

The resulting object will be in descending order so that the first element is the most frequently-occurring element. Excludes NA values by default.

Parameters Name Description normalize bool, default False

If True, then the object returned will contain the relative frequencies of the unique values.

sort bool, default True

Sort by frequencies.

ascending bool, default False

Sort in ascending order.

dropna bool, default True

Don't include counts of NaN.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-12 UTC.

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