Semi-colons in Lua are generally only required when writing multiple statements on a line. So for example: local a,b=1,2; print(a+b) Alternatively written as: local a,b=1,2 print(a+b) Off the top of my head, I can’t remember any other time in Lua where I had to use a semi-colon. Edit: looking in the lua 5.2 reference I … Read more
Remember that in Python, a file is a module that you will most likely import in order to use the classes contained therein. Also remember one of the basic principles of software development “the unit of packaging is the unit of reuse”, which basically means: If classes are most likely used together, or if using … Read more
Edit: three-years later; the times, they are a-changin’… Julik’s answer is the simplest and best way to tackle the problem these days: class Foo attr_accessor :dead alias_method :dead?, :dead # will pick up the reader method end My answer to the original question follows, for posterity… The short version: You can’t use a question mark … Read more
Because it is related to arctan(y/x), so y appears first. Here’s a nice link talking about it a bit: Angles and Directions
If you want to see magic names whether documented or not, go to the Lib directory and run: egrep -oh ‘__[A-Za-z_][A-Za-z_0-9]*__’ *.py | sort | uniq That produces: ‘__all__’ ‘__args__’ ‘__author__’ ‘__bases__’ ‘__builtin__’ ‘__builtins__’ ‘__cached__’ ‘__call__’ ‘__class__’ ‘__copy__’ ‘__credits__’ ‘__date__’ ‘__decimal_context__’ ‘__deepcopy__’ ‘__dict__’ ‘__doc__’ ‘__exception__’ ‘__file__’ ‘__flags__’ ‘__ge__’ ‘__getinitargs__’ ‘__getstate__’ ‘__gt__’ ‘__import__’ ‘__importer__’ ‘__init__’ ‘__ispkg__’ … Read more
With ES6, you can use Template strings: var username=”craig”; console.log(`hello ${username}`); ES5 and below: use the + operator var username=”craig”; var joined = ‘hello ‘ + username; String’s concat(..) var username=”craig”; var joined = ‘hello ‘.concat(username); Alternatively, use Array methods: join(..): var username=”craig”; var joined = [‘hello’, username].join(‘ ‘); Or even fancier, reduce(..) combined with … Read more
__str__() is the old method — it returns bytes. __unicode__() is the new, preferred method — it returns characters. The names are a bit confusing, but in 2.x we’re stuck with them for compatibility reasons. Generally, you should put all your string formatting in __unicode__(), and create a stub __str__() method: def __str__(self): return unicode(self).encode(‘utf-8’) … Read more
Considering that most people that use Hungarian Notation is following the misunderstood version of it, I’d say it’s pretty pointless. If you want to use the original definition of it, it might make more sense, but other than that it is mostly syntactic sugar. If you read the Wikipedia article on the subject, you’ll find … Read more
I have found it simplifies deployment to have the website project contain only content (no compiled code). Something like: Web.Site project Content Images Css Scripts Views web.config And move all compiled code into another project: Web project Controllers Filters Models … Then, you can treat everything within the Web.Site project as needing to be deployed, … Read more
C++ emphasis heavily on types and when it comes to pointers declaration, to avoid any sort of confusion, Bjarne suggested – Stick to one pointer per declaration. From Bjarne Stroustrup’s C++ Style and Technique FAQ [emphasis added]: Is int* p; right or is int *p; right? Both are “right” in the sense that both are … Read more