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PyCifRW 4.4.6

PyCIFRW Readme

Introduction
PyCIFRW provides support for reading and writing CIF (Crystallographic
Information Format) files using Python. It was developed at the
Australian National Beamline Facility (ANBF), run by the Australian
Synchrotron Research Program (ASRP), as part of a larger project to
provide CIF input/output capabilities for data collection. It is
now (Nov 2022) maintained and developed within the Australian Nuclear Science and
Technology Organisation (ANSTO).

Conformance
The specifications found in Vol G of the International Tables for
Crystallography were used as a reference for CIF 1.0/1.1 syntax.
http://dx.doi.org/10.1107/S1600576715021871 was used as the CIF 2.0
reference.
PyCifRW has been tested on the IUCr sample CIF1.1 trip files located at
http://www.iucr.org/iucr-top/cif/developers/trip and fails or
successfully reads as it is supposed to (note that ciftest5 contains
characters now forbidden in CIFs).

Supported Platforms
PyCIFRW is written entirely in Python, and so should run wherever
Python runs. Any failures on Mac, Windows or Linux should be
communicated to the author, either through the Github issues
tracker (http://github.com/jamesrhester/pycifrw/issues) or email.
The source code of a C extension module is also included in the
distribution. This module accelerates CIF file reading. From time to
time system-dependent installation packages are generated containing
precompiled versions of this module.

Installation
See file [INSTALLATION](https://github.com/jamesrhester/pycifrw/blob/development/INSTALLATION).

License
PyCIFRW is made available using the Python 2.0 license. The full text is [here](https://github.com/jamesrhester/pycifrw/blob/development/LICENSE)

Use
See the various files in the docs directory for details of the interface.
Essentially, CIF files look like python dictionaries, with each
entry in the dictionary corresponding to a data block. The blocks
themselves are also dictionaries, with each data name being a
single entry in the dictionary, so for example,
cf[‘si_std’][‘_diffrn_meas_wavelength’] will return the value of
_diffrn_meas_wavelength in the data block named si_std of the Cif file object
cf.

Example
To read in a CIF:

from CifFile import ReadCif
cf = ReadCif(‘jun_01_2.cif’)

to access information in a CIF

wav = cf[‘si_std’][‘_diffrn_meas_wavelength’]

to set a value

cf[‘si_std’][‘_diffrn_meas_wavelength’] = 1.54

Example programs
The file ‘TestPyCIFRW.py’ in the source distribution contains around 170 tests
of PyCIFRW functionality and is a good source of examples for using both simple
and advanced PyCIFRW interfaces.
The “Programs” directory in the source distribution contains simple example programs.
Of interest are validate_cif.py which validates a data files against data dictionaries
(execute this file at a terminal prompt without arguments for a help message)
and output_asciidoc.py which will convert a DDLm dictionary into an
asciidoc document that can then be converted to HTML or other presentation
formats.

PYCIFRW License Agreement (Python License, Version 2)
1. This LICENSE AGREEMENT is between the Australian Nuclear Science
and Technology Organisation (“ANSTO”), and the Individual or
Organization (“Licensee”) accessing and otherwise using this software
(“PyCIFRW”) in source or binary form and its associated documentation.
2. Subject to the terms and conditions of this License Agreement,
ANSTO hereby grants Licensee a nonexclusive, royalty-free, world-wide
license to reproduce, analyze, test, perform and/or display publicly,
prepare derivative works, distribute, and otherwise use PyCIFRW alone
or in any derivative version, provided, however, that this License
Agreement and ANSTO’s notice of copyright, i.e., “Copyright (c)
2001-2014 ANSTO; All Rights Reserved” are retained in PyCIFRW alone or
in any derivative version prepared by Licensee.
3. In the event Licensee prepares a derivative work that is based on
or incorporates PyCIFRW or any part thereof, and wants to make the
derivative work available to others as provided herein, then Licensee
hereby agrees to include in any such work a brief summary of the
changes made to PyCIFRW.
4. ANSTO is making PyCIFRW available to Licensee on an “AS IS”
basis. ANSTO MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, ANSTO MAKES NO AND
DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYCIFRW WILL NOT
INFRINGE ANY THIRD PARTY RIGHTS.
5. ANSTO SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYCIFRW
FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A
RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYCIFRW, OR ANY
DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
6. This License Agreement will automatically terminate upon a material
breach of its terms and conditions.
7. Nothing in this License Agreement shall be deemed to create any
relationship of agency, partnership, or joint venture between ANSTO
and Licensee. This License Agreement does not grant permission to use
ANSTO trademarks or trade name in a trademark sense to endorse or
promote products or services of Licensee, or any third party.
8. By copying, installing or otherwise using PyCIFRW, Licensee agrees
to be bound by the terms and conditions of this License Agreement.