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Why do we use Base64?
...to encode characters not valid for a URL in the URL itself:
http://www.foo.com/hello my friend -> http://www.foo.com/hello%20my%20friend
This is because we want to send a space over a system that will think the space is smelly.
All we are doing is ensuring there is a 1-to-1 mapping between...
Mock vs MagicMock
...
What is the reason for plain Mock existing?
Mock's author, Michael Foord, addressed a very similar question at Pycon 2011 (31:00):
Q: Why was MagicMock made a separate thing rather than just folding the ability into the default mock object?
A: One reasonable answer is that the way M...
Find a value anywhere in a database
...types.
A pseudo-code description could be select * from * where any like 'foo'
--------------------------------------------------------------------------------
-- Search all columns in all tables in a database for a string.
-- Does not search: image, sql_variant or user-defined types.
-- Exact sea...
What's the difference between eval, exec, and compile?
... compile('for i in range(3): print("Python is cool")',
'foo.py', 'exec')
>>> eval(code)
Python is cool
Python is cool
Python is cool
If one looks into eval and exec source code in CPython 3, this is very evident; they both call PyEval_EvalCode with same arguments, the o...
Can anyone explain IEnumerable and IEnumerator to me? [closed]
...merable makes using foreach possible.
When you write code like:
foreach (Foo bar in baz)
{
...
}
it's functionally equivalent to writing:
IEnumerator bat = baz.GetEnumerator();
while (bat.MoveNext())
{
bar = (Foo)bat.Current
...
}
By "functionally equivalent," I mean that's actually ...
Git stash uncached: how to put away all unstaged changes?
...each change before committing:
# ... hack hack hack ...
$ git add --patch foo # add just first part to the index
$ git stash save --keep-index # save all other changes to the stash
$ edit/build/test first part
$ git commit -m 'First part' # commit fully tested change
$ git stash p...
What's so bad about Template Haskell?
...don't compile. You generated an expression that references a free variable foo that doesn't exist? Tough luck, you'll only see that when actually using your code generator, and only under the circumstances that trigger the generation of that particular code. It is very difficult to unit test, too.
...
Wrap a delegate in an IEqualityComparer
...an elegant solution (concept from Python's list sort method).
Usage:
var foo = new List<string> { "abc", "de", "DE" };
// case-insensitive distinct
var distinct = foo.Distinct(new KeyEqualityComparer<string>( x => x.ToLower() ) );
The KeyEqualityComparer class:
public class KeyE...
Comparing Java enum members: == or equals()?
... It's a black mark against Java that some people think that foo.equals(bar) is more readable than foo == bar
– Bennett McElwee
Jul 18 '12 at 5:20
19
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In C#, why is String a reference type that behaves like a value type?
... it's never desirable to check the references, since sometimes new String("foo"); and another new String("foo") can evaluate in the same reference, which kind of is not what you would expect a new operator to do. (Or can you tell me a case where I would want to compare the references?)
...