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Why is “if not someobj:” better than “if someobj == None:” in Python?
...
In the first test, Python try to convert the object to a bool value if it is not already one. Roughly, we are asking the object : are you meaningful or not ? This is done using the following algorithm :
If the object has a __nonzero__ s...
Connection pooling options with JDBC: DBCP vs C3P0
...e. Some time back we conducted an in-house analysis of the two, creating a test fixture which generated load and concurrency against the two to assess their suitability under real life conditions.
DBCP consistently generated exceptions into our test application and struggled to reach levels of per...
How can I view all the git repositories on my machine?
...ly. Man page solution follows "find repo/ ( -exec test -d '{}'/.svn \; -or \ -exec test -d {}/.git \; -or -exec test -d {}/CVS \; ) \ -print -prune Check it out. Edit out svn and cvs if not required
– quiet_penguin
Oct 29 ...
Best way to add “current” class to nav in Rails 3
...m using quite the same way as you are. I've just defined helper methods to test for multiple controller or actions:
In application_helper.rb
def controller?(*controller)
controller.include?(params[:controller])
end
def action?(*action)
action.include?(params[:action])
end
Then y...
Best way to work with transactions in MS SQL Server Management Studio
...nt that you can also (and should if what you are writing is complex) add a test variable to rollback if you are in test mode. Then you can execute the whole thing at once. Often I also add code to see the before and after results of various operations especially if it is a complex script.
Example ...
How to check for valid email address? [duplicate]
...ling it
from the "tokens" defined by the RFC. Each of these tokens is
tested in the accompanying unit test file.
you may need the pyDNS module for checking SMTP servers
pip install pyDNS
or from Ubuntu
apt-get install python3-dns
...
Are PDO prepared statements sufficient to prevent SQL injection?
...ery('SET NAMES gbk');
$var = "\xbf\x27 OR 1=1 /*";
$query = 'SELECT * FROM test WHERE name = ? LIMIT 1';
$stmt = $pdo->prepare($query);
$stmt->execute(array($var));
In certain circumstances, that will return more than 1 row. Let's dissect what's going on here:
Selecting a Character Set
$p...
How to use if - else structure in a batch file?
... and B) THEN X ELSE Y, but in fact means IF A( IF B THEN X ELSE Y). If the test of A fails, then he whole of the inner if-else will be ignored.
As one of the answers mentioned, in this case only one of the tests can succeed so the 'else' is not needed, but of course that only works in this example,...
What is “assert” in JavaScript?
...sertion checking. Usually assertions (as they're called) are used only in "testing" or "debug" builds and stripped out of production code.
Suppose you had a function that was supposed to always accept a string. You'd want to know if someone called that function with something that wasn't a string. ...
What are JavaScript's builtin strings?
..., strings "1", and discovered one beautiful method of RegExp object called test(). Its name can be assembled from all available characters, e.g. "t" and "e" from true, and "s" from false. I have created a string "test" and addressed this method using square brackets notation for regex literal /-/, c...