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pyarrow.schema — Apache Arrow v21.0.0

pyarrow.schema(fields, metadata=None)#

Construct pyarrow.Schema from collection of fields.

Parameters:

fieldsiterable of Fields or tuples, or mapping of strings to DataTypes

Can also pass an object that implements the Arrow PyCapsule Protocol for schemas (has an __arrow_c_schema__ method).

metadatadict, default None

Keys and values must be coercible to bytes.

Returns:

schemapyarrow.Schema

Examples

Create a Schema from iterable of tuples:

>>> import pyarrow as pa
>>> pa.schema([
...     ('some_int', pa.int32()),
...     ('some_string', pa.string()),
...     pa.field('some_required_string', pa.string(), nullable=False)
... ])
some_int: int32
some_string: string
some_required_string: string not null

Create a Schema from iterable of Fields:

>>> pa.schema([
...     pa.field('some_int', pa.int32()),
...     pa.field('some_string', pa.string())
... ])
some_int: int32
some_string: string

DataTypes can also be passed as strings. The following is equivalent to the above example:

>>> pa.schema([
...     pa.field('some_int', "int32"),
...     pa.field('some_string', "string")
... ])
some_int: int32
some_string: string

Or more concisely:

>>> pa.schema([
...     ('some_int', "int32"),
...     ('some_string', "string")
... ])
some_int: int32
some_string: string

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