scippneutron.io.cif.Chunk#

class scippneutron.io.cif.Chunk(pairs, /, *, comment='', schema=None)[source]#

A group of CIF key-value pairs.

Chunks contain one or more key-value pairs where values are scalars, i.e., not arrays. Chunks are represented in files as a group of pairs separated from other chunks and loops by empty lines.

Note that CIF has no concept of chunks; they are only used for organizing data in ScippNeutron.

__init__(pairs, /, *, comment='', schema=None)[source]#

Create a new CIF chunk.

Parameters:

pairs (Mapping[str, Any] | Iterable[tuple[str, Any]] | None) – Defines a mapping from keys (a.k.a. tags) to values.
comment (str, default: '') – Optional comment that can be written above the chunk in the file.
schema (Union[CIFSchema, Iterable[CIFSchema], None], default: None) – CIF schemas used for the chunk. Content is not checked against the schema, but the schema is written to the file.

Methods

`__init__`(pairs, /, *[, comment, schema])	Create a new CIF chunk.
`write`(f)	Write this chunk to a file.

Attributes

`comment`	Optional comment that can be written above the object in the file.
`schema`	CIF schemas used for the object.

write(f)[source]#

Write this chunk to a file.

Used mainly internally, use scippneutron.io.cif.save_cif() instead.

Parameters:: f (TextIO) – File handle.
Return type:: None