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Elegant ways to support equivalence (“equality”) in Python classes

... You need to be careful with inheritance: >>> class Foo: def __eq__(self, other): if isinstance(other, self.__class__): return self.__dict__ == other.__dict__ else: return False >>> class Bar(Foo):pass >>> b = Bar...
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jQuery event to trigger action when a div is made visible

...he clearInterval() upon successful call-out. Here's an example: function foo() { $('.visibilityCheck').each(function() { if ($(this).is(':visible')){ // do something } }); } window.setInterval(foo, 100); You can also perform some performance improvements on i...
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Static member functions error; How to properly write the signature?

... I'm guessing you've done something like: class Foo { static void Bar(); }; ... static void Foo::Bar() { ... } The "static void Foo::Bar" is incorrect. You don't need the second "static". ...
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Is there a ceiling equivalent of // operator in Python?

... so foobar = math.ceil(foo / bar)? Hmm, I can live with that, don't know of anywhere I wanted to use that, was just curious, thanks – Cradam Feb 11 '13 at 22:51 ...
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What is choice_set in this Django app tutorial?

...rom Question too, automatically generating a field on each instance called foo_set where Foo is the model with a ForeignKey field to that model. choice_set is a RelatedManager which can create querysets of Choice objects which relate to the Question instance, e.g. q.choice_set.all() If you don't l...
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Callback after all asynchronous forEach callbacks are completed

... with this when i need to execute forEach with asynchronous tasks inside. foo = [a,b,c,d]; waiting = foo.length; foo.forEach(function(entry){ doAsynchronousFunction(entry,finish) //call finish after each entry } function finish(){ waiting--; if (waiting==0) { //do your J...
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Why is “import *” bad?

...hat. Also, it has a concrete possibility of hiding bugs. import os, sys, foo, sqlalchemy, mystuff from bar import * Now, if the bar module has any of the "os", "mystuff", etc... attributes, they will override the explicitly imported ones, and possibly point to very different things. Defining __a...
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Begin, Rescue and Ensure in Ruby?

...finitions are implicitly also exception blocks, so instead of writing def foo begin # ... rescue # ... end end you write just def foo # ... rescue # ... end or def foo # ... ensure # ... end The same applies to class definitions and module definitions. However, in the...
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Check if a temporary table exists and delete if it exists before creating a temporary table

...blem. The following works fine for me in SQL Server 2005, with the extra "foo" column appearing in the second select result: IF OBJECT_ID('tempdb..#Results') IS NOT NULL DROP TABLE #Results GO CREATE TABLE #Results ( Company CHAR(3), StepId TINYINT, FieldId TINYINT ) GO select company, stepid, fie...
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Import package.* vs import package.SpecificType [duplicate]

...tually a very bad problem. Suppose you write import a.*; import b.*; ... Foo f; and class Foo exists in package a. Now you check in your perfectly compiling code, and six months later, someone adds class Foo to package b. (Perhaps it's a third party lib that added classes in the latest version)...