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What is a NullPointerException, and how do I fix it?
... doSomething() could be written as:
/**
* @param obj An optional foo for ____. May be null, in which case
* the result will be ____.
*/
public void doSomething(SomeObject obj) {
if(obj == null) {
//do something
} else {
//do something else
}
}
Finally, How to pinpo...
Difference between assertEquals and assertSame in phpunit?
...ly about an interpreted value, be it by type juggling or an object with an __magic presentation method (__toString() for example).
A good use case for assertSame() is testing a singleton factory.
class CacheFactoryTest extends TestCase
{
public function testThatCacheFactoryReturnsSingletons()
...
How can I use Guzzle to send a POST request in JSON?
... edited Aug 18 at 7:06
Valor_
2,49255 gold badges3939 silver badges8787 bronze badges
answered Mar 7 '14 at 8:56
...
Git cherry pick vs rebase
... /
D---E---F---G master
Cherry-pick:
$ git checkout master -b topic_new
$ git cherry-pick A^..C
You get:
A---B---C topic
/
D---E---F---G master
\
A'--B'--C' topic_new
for more info about git this book has most of it (http://git-scm.com/book)
...
Putting git hooks into repository
...sh
if [ -x $0.local ]; then
$0.local "$@" || exit $?
fi
if [ -x tracked_hooks/$(basename $0) ]; then
tracked_hooks/$(basename $0) "$@" || exit $?
fi
The installation script would move all pre-existing hooks to the side (append .local to their names), and symlink all known hook names to the...
Backwards migration with Django South
...r app should have a migrations directory, with files in it named like
0000_initial.py
0001_added_some_fields.py
0002_added_some_more_fields.py
0003_deleted_some_stuff.py
Normally, when you run ./manage.py migrate your_app, South runs all new migrations, in order. (It looks at the database tables ...
Mixin vs inheritance
...dited Jun 21 at 11:36
underscore_d
4,91633 gold badges2828 silver badges5454 bronze badges
answered May 13 '09 at 20:42
...
How can I return two values from a function in Python?
... you can return a tuple or a list and unpack it after the call:
def select_choice():
...
return i, card # or [i, card]
my_i, my_card = select_choice()
On line return i, card i, card means creating a tuple. You can also use parenthesis like return (i, card), but tuples are created by com...
Find the most common element in a list
...ponents. Consider for example:
import itertools
import operator
def most_common(L):
# get an iterable of (item, iterable) pairs
SL = sorted((x, i) for i, x in enumerate(L))
# print 'SL:', SL
groups = itertools.groupby(SL, key=operator.itemgetter(0))
# auxiliary function to get "quality"...
How can I find where Python is installed on Windows?
...on about your installation:
import sys
print sys.executable
print sys.exec_prefix
I'm not sure what this will give on your Windows system, but on my Mac executable points to the Python binary and exec_prefix to the installation root.
You could also try this for inspecting your sys module:
impor...