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.

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|
    # +---+------------+
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