Is Python 2.3 compatible with version 2.2? How about PHP 5.1 with PHP 4.4?

In an ideal world, the answer to every such compatability question would be "yes, it is" but it's not always quite that simple. Python's upwards compatability is excellent - as a language, it was designed for the purpose for which it's used to this day, and it's not overburdened with facilities, especially redundant ones, that make onward extension awkward. PHP, alas, started as "Personal Home Pages: and has grown to something much more powerful ... meaning that a few of the (then excellent) early decisions have had to be revisited and there have been a few compatability issues - sometimes solved via the php.ini configuration file. (register_globals and magic_quotes come to mind ...).

However, there's always the exception to disprove the rule ... and I've been talking about Python compatability today, and how the "yield" keyword was added for generators. "That would only be a problem if you happened to have a variable of that name" says I. "We do, quite often" says one of my trainees. "We're very often forcasting the yield of sludge running off a mountain in wet weather"
(written 2006-11-27 18:28:34)

 H101 - Introduction to PHP
Y101 - Introduction to Python
Y105 - Python - Functions, Modules and Packages

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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