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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Sludge off the mountain, and Python and PHP

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 compatibility question would be "yes, it is" but it's not always quite that simple. Python's upwards compatibility 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 compatibility 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 compatibility 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 forecasting the yield of sludge running off a mountain in wet weather"
(written 2006-11-27, updated 2009-01-01)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y105 - Python - Functions, Modules and Packages
  [96] Variable Scope - (2004-10-22)
  [105] Distance Learning - (2004-10-31)
  [294] Python generator functions, lambdas, and iterators - (2005-04-28)
  [303] Lambdas in Python - (2005-05-06)
  [308] Call by name v call by value - (2005-05-11)
  [340] Code and code maintainance efficiency - (2005-06-08)
  [386] What is a callback? - (2005-07-22)
  [418] Difference between import and from in Python - (2005-08-18)
  [561] Python's Generator functions - (2006-01-11)
  [668] Python - block insets help with documentation - (2006-04-04)
  [745] Python modules. The distribution, The Cheese Shop and the Vaults of Parnassus. - (2006-06-05)
  [749] Cottage industry or production line data handling methods - (2006-06-07)
  [775] Do not duplicate your code - (2006-06-23)
  [821] Dynamic functions and names - Python - (2006-08-03)
  [900] Python - function v method - (2006-10-20)
  [912] Recursion in Python - (2006-11-02)
  [913] Python - A list of methods - (2006-11-03)
  [959] It's the 1st, not the 1nd 1rd or 1th. - (2006-12-01)
  [1134] Function / method parameters with * and ** in Python - (2007-04-04)
  [1163] A better alternative to cutting and pasting code - (2007-04-26)
  [1202] Returning multiple values from a function (Perl, PHP, Python) - (2007-05-24)
  [1464] Python Script - easy examples of lots of basics - (2007-12-08)
  [1784] Global - Tcl, PHP, Python - (2008-09-03)
  [1790] Sharing variables with functions, but keeping them local too - Python - (2008-09-09)
  [1869] Anonymous functions (lambdas) and map in Python - (2008-11-04)
  [1870] What to do with a huge crop of apples - (2008-11-04)
  [1871] Optional and named parameters in Python - (2008-11-05)
  [1879] Dynamic code - Python - (2008-11-11)
  [2011] Conversion of OSI grid references to Eastings and Northings - (2009-01-28)
  [2439] Multiple returns from a function in Python - (2009-10-06)
  [2440] Optional parameters to Python functions - (2009-10-07)
  [2481] Sample code with errors in it on our web site - (2009-10-29)
  [2506] Good example of recursion in Python - analyse an RSS feed - (2009-11-18)
  [2520] Global and Enable - two misused words! - (2009-11-30)
  [2718] Python - access to variables in the outer scope - (2010-04-12)
  [2766] Optional and named parameters to Python functions/methods - (2010-05-15)
  [2878] Program for reliability and efficiency - do not duplicate, but rather share and re-use - (2010-07-19)
  [2929] Passing a variable number of parameters in to a function / method - (2010-08-20)
  [2994] Python - some common questions answered in code examples - (2010-10-10)
  [2998] Using an exception to initialise a static variable in a Python function / method - (2010-10-13)
  [3159] Returning multiple values from a function call in various languages - a comparison - (2011-02-06)
  [3280] Passing parameters to Python functions - the options you have - (2011-05-07)
  [3459] Catching the fishes first? - (2011-09-27)
  [3464] Passing optional and named parameters to python methods - (2011-10-04)
  [3472] Static variables in functions - and better ways using objects - (2011-10-10)
  [3474] Python Packages - groupings of modules. An introduction - (2011-10-11)
  [3662] Finding all the unique lines in a file, using Python or Perl - (2012-03-20)
  [3695] Functions are first class variables in Lua and Python - (2012-04-13)
  [3766] Python timing - when to use a list, and when to use a generator - (2012-06-16)
  [3852] Static variables in Python? - (2012-08-29)
  [3885] Default local - a good choice by the author of Python - (2012-10-08)
  [3931] Optional positional and named parameters in Python - (2012-11-23)
  [3945] vargs in Python - how to call a method with unknown number of parameters - (2012-12-06)
  [4029] Exception, Lambda, Generator, Slice, Dict - examples in one Python program - (2013-03-04)
  [4161] Python varables - checking existance, and call by name or by value? - (2013-08-27)
  [4212] Python functions - an introduction to how they work - (2013-11-16)
  [4361] Multiple yields and no loops in a Python generator? - (2014-12-22)
  [4407] Python - even named code blocks are objects - (2015-01-28)
  [4410] A good example of recursion - a real use in Python - (2015-02-01)
  [4441] Reading command line parameters in Python - (2015-02-23)
  [4448] What is the difference between a function and a method? - (2015-03-04)
  [4645] What are callbacks? Why use them? An example in Python - (2016-02-11)
  [4662] Recursion in Python - the classic example - (2016-03-07)
  [4719] Nesting decorators - (2016-11-02)
  [4722] Embedding more complex code into a named block - (2016-11-04)
  [4724] From and Import in Python - where is the module loaded from? - (2016-11-06)

Y101 - Introduction to Python
  [317] Programming languages - a comparison - (2005-05-20)
  [380] Bridging to the customer requirement - (2005-07-16)
  [382] Central London Courses - Perl, PHP, Python, Tcl, MySQL - (2005-07-18)
  [444] Database or Progamming - which to learn first? - (2005-09-13)
  [629] Choosing the right language - (2006-03-01)
  [710] Linux training Glasgow, Python programming course Dundee - (2006-05-05)
  [712] Why reinvent the wheel - (2006-05-06)
  [753] Python 3000 - the next generation - (2006-06-09)
  [834] Python makes University Challenge - (2006-08-15)
  [846] Is Perl being replaced by PHP and Python? - (2006-08-27)
  [909] Python is like a narrowboat - (2006-10-30)
  [950] Python and the Magic Roundabout - (2006-11-27)
  [1375] Python v Ruby - (2007-10-02)
  [1663] Python in an afternoon - a lecture for experienced programmers - (2008-06-01)
  [4118] We not only teach PHP and Python - we teach good PHP and Python Practice! - (2013-06-18)
  [4298] Python - an interesting application - (2014-09-18)
  [4590] Progress on moving from Python 2 to Python 3 - training for both versions - (2015-12-01)

H101 - Introduction to PHP
  [48] PHP - onwards and upwards - (2004-09-14)
  [55] Evening classes to learn PHP - (2004-09-19)
  [93] Case Sensitive? - (2004-10-19)
  [124] PHP v Java - (2004-11-20)
  [132] Portrait of the author - (2004-11-27)
  [135] Too many Perls - (2004-11-30)
  [341] Happy Birthday, PHP - (2005-06-09)
  [433] FTP - how to make the right transfers - (2005-09-01)
  [577] Learning to program in Perl or PHP - (2006-01-26)
  [624] It's REALLY easy to add a little PHP - (2006-02-26)
  [646] PHP - London course, Melksham Course, Evening course - (2006-03-14)
  [691] Testing you Perl / PHP / MySQL / Tcl knowledge - (2006-04-19)
  [789] Hot answers in PHP - (2006-07-02)
  [795] Remember a site's non-technical issues too - (2006-07-07)
  [917] Syntax checking in PHP - (2006-11-07)
  [924] The LAMP Cookbook - Linux, Apache, MySQL, PHP / Perl - (2006-11-13)
  [1050] The HTML++ Metalanguage - (2007-01-22)
  [1198] From Web to Web 2 - (2007-05-21)
  [1717] Q - Should I use Perl or Python? - (2008-07-23)
  [1753] Perl v PHP, choosing the right language - (2008-08-14)
  [1958] PHP - Parse error: syntax error, unexpected $end ... - (2008-12-23)
  [2097] PHP Course - for hobby / club / charity users. - (2009-03-22)
  [3025] Learning to Program ... in PHP. Course examples. - (2010-11-01)
  [4621] The power of scripting - (2016-01-12)


Back to
Running an on line campaign
Previous and next
or
Horse's mouth home
Forward to
Python and the Magic Roundabout
Some other Articles
Christmas in November
Coming from London to Melksham by train for a course
What happened at Geekmas
Sludge off the mountain, and Python and PHP
Running an on line campaign
What is an SQL injection attack?
Look around this mouth.
Code quality counts
Just ******* Google it
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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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