tueda/python-form

A Python package for communicating with FORM.

python-form

This package provides a mechanism to embed FORM [1] [2] [3] programs in Python code. The basic idea of the implementation is the same as FormLink [4]: it utilizes unnamed pipes between FORM and an external program [5], Python in this case. It is expected to work on Unix-like systems.

Installation

$ pip install python-form

or directly from GitHub for the latest development version:

$ pip install git+https://github.com/tueda/python-form.git

See also the documentation for pip install.

Example

import form

with form.open() as f:
    f.write('''
        AutoDeclare Vector p;
        Local F = g_(0,p1,...,p6);
        trace4,0;
        .sort
    ''')
    print(f.read('F'))

Documentation

• Package Documentation
• CHANGELOG

Licence

python-form is distributed under the MIT licence. See the LICENCE file.

Note that FORM itself adopts the GPL version 3. A program/package using FORM via python-form could be considered as an aggregate (at your own risk) or a combined work affected by the GPL.

References

[1]	J.A.M. Vermaseren, New features of FORM, arXiv:math-ph/0010025.

[2]	J. Kuipers, T. Ueda, J.A.M. Vermaseren and J. Vollinga, FORM version 4.0, Comput.Phys.Commun. 184 (2013) 1453-1467, arXiv:1203.6543 [cs.SC].

[3]	https://github.com/vermaseren/form

[4]	Feng Feng and Rolf Mertig, FormLink/FeynCalcFormLink : Embedding FORM in Mathematica and FeynCalc, arXiv:1212.3522 [hep-ph].

[5]	M. Tentyukov and J.A.M. Vermaseren, Extension of the functionality of the symbolic program FORM by external software, Comput.Phys.Commun. 176 (2007) 385-405, arXiv:cs/0604052.

python-form's Issues

Difficult to specify environment variables for a python-form session.

When running a FORM code with python-form that has such a pragma e.g.:

#: MaxTermsize 1M

Then it is not interpreted correctly, in the sense that it is not updating that environment value for FORM when executing the code.
This is likely because a FORM session/kernel has already been started by then and it cannot update this option afterwards.
But then, what would be nice is to be able to update these FORM environment variables as options to the open(...) function.

For now I can make sure to specify the path of my FORM interpreter to one where I have an appropriate form.set file, but it'd be more convenient to be able to supply this with python options as I suggested.

How to put option to Print operator/ to read method?

I want to get each term on different line, like Print +s; Is there any way to do it?

where form saves log?

I start form with f = form.open(keep_log=True), in text of program I write on statistics;, and then I found file xform01427.str near .ipynb file I run, but that file is void.
Where form saves log?