CHANGES FROM VERSION 1.7.1: SimPy

Authors:	Tony Vignaux <Vignaux@users.sourceforge.net> Klaus Muller <Muller@users.sourceforge.net>
SimPy version:	1.8
SimPy Web-site:	http://simpy.sourceforge.net/
SimPy wiki:	http://www.mcs.vuw.ac.nz/cgi-bin/wiki/SimPy
Python-Version:	2.3+
Revision:	1.1.1.12
Date:	2007-01-09

This document addresses the difference between SimPy versions 1.7.1 and version 1.8 in terms of changes and additions.

Changes

SimPy 1.8 and future releases will not run under the obsolete Python 2.2 version.
The Manual has been thoroughly edited, restructured and rewritten with a view to greater clarity and readability. It is provided in both HTML and PDF format.
The Cheatsheet has been totally rewritten in a tabular format and reduced to just a few pages. The goal was to turn it into a concise desktop reference of SimPy commands. The Cheatsheet is provided in both XLS (MS Excel spreadsheet) and PDF format.
The obsolete Interfacing document has been replaced by a brief introduction to using the matplotlib library for publication-quality plotting of SimPy- produced data.
The version of SimPy.Simulation(RT/Trace/Step) is now accessible by the variable 'version'.
The __str__ method of Histogram was changed to return a table format (like that produced by the new printHistogram method of Monitor and Tally).

Repaired a bug in yield waituntil runtime code.
Introduced check for capacity parameter of a Level or a Store being a number > 0.
Added code so that self.eventsFired gets set correctly after an event fires in a compound yield get/put with a waitevent clause (reneging case).
Repaired a bug in prettyprinting of Store objects (the buffer content, i.e. ._theBuffer was not shown) by changing ._theBuffer to .theBuffer.

New compound yield statements support time-out or event-based reneging in get and put operations on Store and Level instances.
yield get on a Store instance can now have a filter function which selects which and how many items (e.g. "3 parcels weighing less than 3 pounds) should be retrieved.
All Monitor and Tally instances are automatically registered in list allMonitors and allTallies, respectively.
The new function startCollection allows activation of Monitors and Tallies at a specified time (e.g. after warmup period).
A printHistogram method was added to Tally and Monitor which generates a niceley formatted table-form histogram.
In SimPy.SimulationRT: A function for allowing changing the ratio wall clock time to simulation time has been added. It facilitates slowing down or speeding up model execution, e.g. for interactive models or games.