dataframelike

DataFramelike is a term used in data science and software development to describe data structures or objects that resemble a data frame in their interface and behavior, though they may not be actual DataFrame implementations. It denotes any tabular data container with named columns and an index-like row identifier that supports common table operations.

Characteristics include a tabular organization with labeled columns and column-wise data types, the ability to select and mutate columns, filter rows, sort data, and group or aggregate. DataFramelike objects typically support joining or merging with other tables, handling missing values, and preserving or transforming index alignment. They may be mutable or immutable, eager or lazy in evaluation, and may optimize memory layout for performance. The concept emphasizes API compatibility and behavioral expectations rather than strict type identity.

Variants and examples span multiple ecosystems. In Python, data frame-like objects appear in libraries such as pandas, PyArrow, and polars, each offering DataFrame-like interfaces. Other environments include xarray in Python for labeled multi-dimensional data, data.frame or tibble in R, and DataFrames.jl in Julia. The term also covers lightweight wrappers, adapters, or views that expose DataFrame-like APIs over different backends such as CSV files, SQL query results, or in-memory arrays.

Significance lies in facilitating interoperability, API design, testing, and data interchange across libraries and languages. Describing a container as DataFramelike helps compare features, performance characteristics, and compatibility of tabular data processing tools without committing to a single implementation.