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  • Python Success Stories

    Python Success Stories Background The Molecular Modeling Toolkit (MMTK) is a open source Python library for molecular modeling and simulation with a focus on biomolecular systems, written in a mixture of Python and C. It provides standard techniques such as Molecular Dynamics or normal mode calculations in a ready-to-use form, but also provides a basis of low-level operations on top of which new techniques can easily be implemented. I started developing MMTK in 1996. I had some experience wit...

  • Python Patterns - Implementing Graphs

    Python Patterns - Implementing Graphs Warning This page stays here for historical reasons and it may contain outdated or incorrect information. Change notes: 2/22/98, 3/2/98, 12/4/00: This version of this essay fixes several bugs in the code. 6/10/19: Retraction of find_shortest_path as "nearly optimal". 8/11/19: Fix accidental usage of find_graph() instead of find_path() Copyright (c) 1998, 2000, 2003, 2019 Python Software Foundation. All rights reserved. License...

  • Glue It All Together With Python

    Glue It All Together With Python Glue It All Together With Python Guido van Rossum CNRI 1895 Preston White Drive Reston, VA 20191 Email: guido@cnri.reston.va.us, guido@python.org Position paper for the OMG-DARPA-MCC Workshop on Compositional Software Architecture in Monterey, California, January 6-8, 1998. Introduction Python is an advanced scripting language that is being used successfully to glue together large software components. It spans multiple platforms, mid...

  • What's new in Python 2.3

    What's new in Python 2.3 What's new in Python 2.3 Here are the (subjective) highlights of what's new in Python 2.3. Faster According to a couple of simple benchmark, Python 2.3 is about 20-30% faster than Python 2.2.3. Some of this speed-up was obtained by removing the SET_LINENO opcodes, which means that the difference is less impressive when comparing "python -O"; the rest was various careful tune-ups. New Tools A brand new version of IDLE (from the IDLEfork project at S...

  • Python Success Stories

    Python Success Stories Introduction Nexedi is a leader in high-end enterprise services, providing solutions for Enterprise Resource Planning (ERP), Customer Relationship Management (CRM), and eCommerce. Nexedi has built its business on Open Source, and has designed and released an ERP/CRM framework called ERP5 under the GPL Free Software license. ERP5 is in production in the apparel industry and government agencies with multi-gigabyte databases that track millions of warehouse stock movements...

  • Python Success Stories

    Python Success Stories Introduction Strakt is a Swedish company which specializes in developing scalable and secure products for collaboration in workflow intensive workplaces. Our vision is to empower professionals to collaborate in an enjoyable, intuitive, and efficient way that is tailored to their and their organisations' needs, while simultaneously developing and maintaining digitally stored organisational memory. In 2001, AB Strakt embarked on a large software development project aimed ...

  • Foreword for "Programming Python" (1st ed.)

    Foreword for "Programming Python" (1st ed.) Foreword for "Programming Python" (1st ed.) This is the foreword I wrote for Mark Lutz' book "Programming Python" (1st ed.), published by O'Reilly. See also my foreword to the 2nd edition. As Python's creator, I'd like to say a few words about its origins, adding a bit of personal philosophy. Over six years ago, in December 1989, I was looking for a "hobby" programming project that would keep me occupied during the we...

  • Python Success Stories

    Python Success Stories Introduction This is the story of Python at the Philips semiconductor manufacturing facility in Fishkill, NY. This facility, originally built by IBM, was acquired by Philips in 2000. I have been involved with this facility on and off for the past twelve years and was responsible for redesigning substantial portions of the factory tool control software using Python. In the early 1990s, the factory adopted an automation strategy based around Asyst Technology's tool loader...

  • Python Success Stories

    ...efficiency, and will have created an acceptance test along the way to measure and monitor this going forward. Conclusion Using Python so extensively, for our sole product and our internal development infrastructure, has made it a mission critical component for our company's success. Python has admirably supported our requirements, from the robust features of the language itself, the excellent .NET implementation provided by the IronPython project, and the thriving community of discussion, sup...

  • Unifying types and classes in Python 2.2

    ...efficiency (when m is idempotent), at worst an error. Classic Python has the same problem, except it doesn't even consider it an error to inherit two conflicting definitions of a method: it simply picks the first one. The traditional solution to this dilemma is to split each derived definition of m into two parts: a partial implementation _m, which only saves the data that is unique to one class, and a full implementation m, which calls its own _m and that of the base class(es). For e...

  • Unifying types and classes in Python 2.2

    ...efficiency (when m is idempotent), at worst an error. Classic Python has the same problem, except it doesn't even consider it an error to inherit two conflicting definitions of a method: it simply picks the first one. The traditional solution to this dilemma is to split each derived definition of m into two parts: a partial implementation _m, which only saves the data that is unique to one class, and a full implementation m, which calls its own _m and that of the base class(es). For e...

  • Unifying types and classes in Python 2.2

    ...efficiency (when m is idempotent), at worst an error. Classic Python has the same problem, except it doesn't even consider it an error to inherit two conflicting definitions of a method: it simply picks the first one. The traditional solution to this dilemma is to split each derived definition of m into two parts: a partial implementation _m, which only saves the data that is unique to one class, and a full implementation m, which calls its own _m and that of the base class(es). For e...

  • Towards a Standard Parser Generator

    Towards a Standard Parser Generator Towards a Standard Parser Generator Martin v. Löwis Humboldt-Universität zu Berlin Institut für Informatik loewis@informatik.hu-berlin.de Abstract Developing parsers for "little" languages is a common task for many software developers. People have frequently requested inclusion of a specific parser generator framework into the Python library. In this paper, we compare several Python parser generators, using the XPath langua...

  • Python Success Stories

    Python Success Stories Introduction Wing IDE is a commercial integrated development environment for the Python programming language. Wing provides developers with a full-featured source editor, debugger, code browser, and many other tools specifically designed for use with Python. Wing works with all forms of Python, whether running as a stand-alone app, under a web server, or in a custom embedded scripting environment. Several GUI layers (wxPython, PyQt, PyGTK, and Tkinter) are supported, as...

  • Unifying types and classes in Python 2.2

    ...efficiency (when m is idempotent), at worst an error. Classic Python has the same problem, except it doesn't even consider it an error to inherit two conflicting definitions of a method: it simply picks the first one. The traditional solution to this dilemma is to split each derived definition of m into two parts: a partial implementation _m, which only saves the data that is unique to one class, and a full implementation m, which calls its own _m and that of the base class(es). For e...

  • EDU-SIG: Python in Education

    EDU-SIG: Python in Education EDU-SIG: Python in Education More and more, Python is making inroads at all levels in education. Python offers an interactive environment in which to explore procedural, functional and object oriented approaches to problem solving. Its high level data structures and clear syntax make it an ideal first language, while the large number of existing libraries make it suitable to tackle almost any programming tasks. Edu-sig, through its mailing list, provides an infor...

  • Notes

    Notes (editors: check NEWS.help for information about editing NEWS using ReST.) What's New in Python 2.4 final? Release date: 30-NOV-2004 Core and builtins Bug 875692: Improve signal handling, especially when using threads, by forcing an early re-execution of PyEval_EvalFrame() "periodic" code when things_to_do is not cleared by Py_MakePendingCalls(). What's New in Python 2.4 (release candidate 1) Release date: 18-NOV-2004 Core and builtins Bug 1061968: Fixes in 2.4a3 to ad...

  • Parade of the PEPs

    Parade of the PEPs Parade of the PEPs To start off Developer's Day at the Python10 conference I gave a keynote ending in what I dubbed "the parade of the PEPs". It was a brief overview of all open PEPs, where I gave my highly personal and subjective opinion for each PEP. Later, I realized that this might have been of interest to other developers. I didn't take notes at the conference, so below is a different set of comments that I created from scratch during a single two-hour sitt...

  • Python 2.4.1 - Release Notes

    Python 2.4.1 - Release Notes (editors: check NEWS.help for information about editing NEWS using ReST.) What's New in Python 2.4.1 final? Release date: 30-MAR-2005 Core and builtins Move exception finalisation later in the shutdown process - this fixes the crash seen in bug #1165761 Tests SF patch 1167316: doctest.py fails self-test if run directly. Build SF patch 1171767: Darwin 8's headers are anal about POSIX compliance, and linking has changed (prebinding is now deprecated, and l...

  • Notes

    Notes (editors: check NEWS.help for information about editing NEWS using ReST.) What's New in Python 2.3.5? Release date: 08-FEB-2005 Core and builtins Partially revert the fix for #1074011; don't try to fflush stdin anymore. Library Applied a security fix to SimpleXMLRPCserver (PSF-2005-001). This disables recursive traversal through instance attributes, which can be exploited in various ways. Bug #1114776. Applied a fix to the copy.py fix in 2.3.5rc1 to deal with types that don't hav...