format (DataFrameReader)

Specifies the input data source format.

Syntax

format(source)

Parameters

Parameter	Type	Description
source	str	The name of the data source, for example 'json' or 'parquet'.

Returns

DataFrameReader

Examples

Write a DataFrame into a JSON file and read it back.

Python

import tempfile
with tempfile.TemporaryDirectory(prefix="format") as d:
    spark.createDataFrame(
        [{"age": 100, "name": "Alice"}]
    ).write.mode("overwrite").format("json").save(d)

    spark.read.format('json').load(d).show()
    # +---+------------+
    # |age|        name|
    # +---+------------+
    # |100|Alice|
    # +---+------------+