http://learnpython.pbwiki.com/ How to learn Python - for beginners en http://learnpython.pbwiki.com/feedlogo.gif http://pbwiki.com/ PBwiki 1.3.8 support@pbwiki.com http://learnpython.pbwiki.com/TasksAdvanced email.hidden@example.com (p) p edited TasksAdvanced Guessing numbers ( mastermind )
Computer generates a number, player tries to guess it and computer answers
Enhancements:
program which plays game (tries to guess)
program which runs "AI championship" - program solutions of above point, even competition for best program
20 questions
You guess a thing/animal etc. Computer asks questions, you answer yes/no, until runs out of questions.
Enhancements:
If knowledgebase does not include correct answer, programs asks 'whats the difference' and extends knowledgebase
restructure knowledgebase
Simple AI problems
3 cannibals and 3 missionaries, or sheep, dog and hay: program searches through all possibilities, rejects invalid moves, finds all possible solution
Theseus
Generate labyrinth with one entrance, one exit, and one possible path (or path to center). Every cell needs be connected to path, many dead ends possible, but no "closed islands".
Enhancements:
create program solving labyrinth
Generato]]> Sun, 17 Aug 2008 10:41:05 +0000 mod http://learnpython.pbwiki.com/RulesOfThumb email.hidden@example.com (peter) peter edited RulesOfThumb Variables:
detailed). But
But don't use single-char names: names (they are hard to find/replace later if you need to): use "for ii in range(10)" for loop where you don't care about the variable, but name it if you plan to use it.
]]> Wed, 13 Aug 2008 10:17:00 +0000 mod http://learnpython.pbwiki.com/RulesOfThumb email.hidden@example.com (peter) peter added RulesOfThumb Variables:

use variables whose name-length is proportional to the size of their scope: the longer the scope, the longer the name (more detailed). But don\'t use single-char names: use \"for ii in range(10)\" for loop where you don\'t care about the variable, but name it if you plan to use it.
]]> Wed, 13 Aug 2008 10:16:18 +0000 add http://learnpython.pbwiki.com/FrontPage email.hidden@example.com (peter) peter edited FrontPage Python Books - Books and tutorials for beginners and experienced programmers and other online and offline resources
PythonTricks - common mistakes and gotchas
RulesOfThumb -
Solving problems
RealLifeProblems - what problems real-life learners had, and how to fix them
]]> Wed, 13 Aug 2008 10:14:16 +0000 mod http://learnpython.pbwiki.com/TasksAdvanced email.hidden@example.com (peter) peter added TasksAdvanced [http://groups.google.com/group/comp.lang.python/browse_thread/thread/99e43f326aaf93e5/ sudoku solvers]
]]> Tue, 12 Aug 2008 15:49:40 +0000 add http://learnpython.pbwiki.com/PythonSpeed email.hidden@example.com (peter) peter added PythonSpeed [http://groups.google.com/group/comp.lang.python/browse_thread/thread/df14a32d10432940/ how Python is compiled], differences from JVM and .NET - and python experts pwned by a troll :-)

[http://groups.google.com/group/comp.lang.python/browse_thread/thread/cf5ab4fab83f7988/ different kinds of optimization]
]]> Tue, 12 Aug 2008 15:48:39 +0000 add http://learnpython.pbwiki.com/FrontPage email.hidden@example.com (peter) peter edited FrontPage Advanced topics
Assignment - CreateObject
PythonSpeed
MultipleInheritance - ClassTricks - ListTricks - FloatTricks - TuningTricks - DecoratorTricks
ErrorLogging - XML -
]]> Tue, 12 Aug 2008 15:18:58 +0000 mod http://learnpython.pbwiki.com/DecoratorTricks email.hidden@example.com (peter) peter added DecoratorTricks [http://groups.google.com/group/comp.lang.python/browse_thread/thread/32b421bbe6caaeed/ decorator to auto-assign attributes in creator]

----

http://wiki.python.org/moin/PythonDecoratorLibrary
]]> Tue, 12 Aug 2008 15:18:09 +0000 add http://learnpython.pbwiki.com/FrontPage email.hidden@example.com (peter) peter edited FrontPage Advanced topics
Assignment - CreateObject
- TuningTricks TuningTricks - DecoratorTricks
ErrorLogging - XML -
AppEngine
]]> Tue, 12 Aug 2008 14:38:00 +0000 mod http://learnpython.pbwiki.com/CreateObject email.hidden@example.com (peter) peter added CreateObject [http://groups.google.com/group/comp.lang.python/browse_thread/thread/3fcb1673e25cdfe8/ explain __int__]

obj3 = MyClass()

(it\'s the () that creates the object, not the =)

_ _new__ is the constructor: it creates the instance and returns it (overriding: advanced topic)

Along the way, it calls _ _init__ on the *already-created* instance, to
ask it to initialise itself ready for use. So, _ _init__ is an
\"initialiser\" for the instance, used often. Rarely you override _ _new__, but customizing _ _init__ is common: http://www.python.org/doc/ref/customization.html

obj = mytype.__new__(*args, **kwds)
if isinstance(obj, mytype):
mytype.__init__(obj, *args, **kwds)
return obj

Nevertheless, _ _init__ doesn\'t construct anything. You can even call
it to reinitialize an existing object.

Also, how can a constructor require \'self\' as an argument...?
_ _init__(self, ...)

If the _ _init__ function is called by the constructor it cannot return a
value. However if cal]]> Tue, 05 Aug 2008 14:18:41 +0000 add http://learnpython.pbwiki.com/FrontPage email.hidden@example.com (peter) peter edited FrontPage Tasks (or etudes, a term coined by excellend book EtudesforProgrammers, one of the best programming books ever, long time out of print) with glowing reviews
Advanced topics
ErrorLoggingAssignment - XML - Assignment CreateObject
MultipleInheritance - ClassTricks - ListTricks - FloatTricks - TuningTricks
ErrorLogging - XML -
AppEngine
Links, Feedback, question, suggestions, links
]]> Tue, 05 Aug 2008 14:02:45 +0000 mod http://learnpython.pbwiki.com/Assignment email.hidden@example.com (peter) peter edited Assignment Since all "variable" names in Python are references to objects, anything accessed using a name is accessed by reference?
Anybody using the terms variable, reference or call-by-value is most likely explaining Python the wrong way
http://effbot.org/zone/python-objects.htm (name - binding to value of some type)
http://effbot.org/zone/call-by-object.htm - "call by sharing"
But you must be careful about what is meant by "changes to parameters". Assigning a new value to a parameter name (inside the function, a parameter is just a local variable) does not change the original object--it only rebinds the local variable to a new object.
In the following function, a is rebound with an assignment statement, while b is mutated, i.e., changed, with an assignment statement.
]]> Tue, 05 Aug 2008 14:01:46 +0000 mod http://learnpython.pbwiki.com/Assignment email.hidden@example.com (peter) peter added Assignment Since all \"variable\" names in Python are references to objects, anything accessed using a name is accessed by reference?

Anybody using the terms variable, reference or call-by-value is most likely explaining Python the wrong way

But you must be careful about what is meant by \"changes to parameters\". Assigning a new value to a parameter name (inside the function, a parameter is just a local variable) does not change the original object--it only rebinds the local variable to a new object.

In the following function, a is rebound with an assignment statement, while b is mutated, i.e., changed, with an assignment statement.

def f(a, b):
a = 12
b.value = 14

Argument a will never be changed, while argument b will be. Python\'s argument passing semantics are extremely simple. It\'s the assignment statement that\'s tricky: some assignments mutate/change objects, and some only rebind names.
]]> Tue, 05 Aug 2008 13:38:00 +0000 add http://learnpython.pbwiki.com/FrontPage email.hidden@example.com (peter) peter edited FrontPage Tasks (or etudes, a term coined by excellend book EtudesforProgrammers, one of the best programming books ever, long time out of print) with glowing reviews
Advanced topics
XML - - Assignment
MultipleInheritance - ClassTricks - ListTricks - FloatTricks - TuningTricks
AppEngine
]]> Tue, 05 Aug 2008 13:34:38 +0000 mod http://learnpython.pbwiki.com/TuningTricks email.hidden@example.com (peter) peter added TuningTricks [http://groups.google.com/group/comp.lang.python/browse_thread/thread/b3ded6d0f494d06/ from email list] optimizing histogram of numbers in huge file

- wrap your code in a function. Functions run much faster in python than module level code,
- look into using collections.defaultdict for histogram. A dictionary is a very appropriate way to store this data. numpy is good for processing numeric data once they are already in arrays, not for populating them.

Both Python \"array.array\" and \"list\" are implemented as dyn arrays, not as C-like linked lists.
]]> Tue, 05 Aug 2008 13:31:25 +0000 add http://learnpython.pbwiki.com/FrontPage email.hidden@example.com (peter) peter edited FrontPage Advanced topics
ErrorLogging - XML -
- FloatTricks FloatTricks - TuningTricks
AppEngine
Links, Feedback, question, suggestions, links
]]> Tue, 05 Aug 2008 12:48:40 +0000 mod http://learnpython.pbwiki.com/TasksBeginners email.hidden@example.com (peter) peter edited TasksBeginners ProjectEuler - froms very simple, to quite tricky, math-based problems
Python Challenge - http://www.pythonchallenge.com/ is fun way to learn Python. Every solved task enables you to view next. Forums with hints.
forjava - but solve them in Python
]]> Fri, 18 Jul 2008 16:17:29 +0000 mod http://learnpython.pbwiki.com/OtherLanguages email.hidden@example.com (p) p added OtherLanguages > What language is the best? Is there no clear answer?


There cannot be clear answer because language you use to describe the solution influences your thinking about how to solve the problem, and what *is* the problem.

Because the only way to express the solution is using a language, selecting a language determines patterns you will use to express the solution. Language changes your brain, your way of thinking.

Only with a lot of skill and experience, when you can solve the problem using many different languages and approaches, you can understand how parts of your particular solution (expressed in a given language) relate to different solutions of the same problem expressed in different language.

Only then you can transcendent (\"solve\") the question of language - and even then you cannot pass this knowledge and understanding to others, they have to gain insight by own efforts. A guru can hint, but it\'s the student who has to do the learning.

Without this insight, answer is trivial \"it depe]]> Tue, 15 Jul 2008 17:22:44 +0000 add http://learnpython.pbwiki.com/PaperBooks email.hidden@example.com (p) p edited PaperBooks Good Paper Books
Python books
PythonPocketReference - best spent $10 on a must-have book
LearningPython - 3nd edition, 2007
BeginningPython (From Novice to Professional series)
BeginningGameDevelopmentwithPythonandPygame (From Novice to Professional series)
Other good books
HeadFirstHTMLwithCSS&XHTML
CSSPocketReference
JavaScriptPocketReference
]]> Sun, 29 Jun 2008 13:32:18 +0000 mod http://learnpython.pbwiki.com/PaperBooks email.hidden@example.com (p) p edited PaperBooks PythonProgramming:AnIntroductiontoComputerScience used in MIT. It's intro to Comp Sci using Python, not strictly Python beginner book
PythonProgrammingfortheAbsoluteBeginner
BeginningPython:FromNovicetoProfessionalBeginningPython (From Novice to Professional series)
BeginningGameDevelopmentwithPythonandPygame (From Novice to Professional series)
]]> Sun, 29 Jun 2008 13:23:07 +0000 mod