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How to delete the contents of a folder?
...emented. It removes all the content of a folder but not the folder itself. Tested on Linux with files, folders and symbolic links, should work on Windows as well.
import os
import shutil
for root, dirs, files in os.walk('/path/to/folder'):
for f in files:
os.unlink(os.path.join(root, f...
Setting action for back button in navigation controller
...
@TimAutin I just tested this again and seems like something has changed. Key part to understand that in a UINavigationController, the navigationBar.delegate is set to the navigation controller. So the methods SHOULD get called. However, in Sw...
How do I add the contents of an iterable to a set?
...nce competitive with doing aset.update(), here's an example of how you can test your beliefs quickly before going public:
>\python27\python -mtimeit -s"it=xrange(10000);a=set(xrange(100))" "a.update(it)"
1000 loops, best of 3: 294 usec per loop
>\python27\python -mtimeit -s"it=xrange(10000);...
What is the use case of noop [:] in bash?
...or if statements when I comment out all the code. For example you have a test:
if [ "$foo" != "1" ]
then
echo Success
fi
but you want to temporarily comment out everything contained within:
if [ "$foo" != "1" ]
then
#echo Success
fi
Which causes bash to give a syntax error:
line 4:...
Make sure only a single instance of a program is running
...code should do the job, it is cross-platform and runs on Python 2.4-3.2. I tested it on Windows, OS X and Linux.
from tendo import singleton
me = singleton.SingleInstance() # will sys.exit(-1) if other instance is running
The latest code version is available singleton.py. Please file bugs here.
...
Setting “checked” for a checkbox with jQuery
...('checked', false);
Note that this is the approach used by jQuery's unit tests prior to version 1.6 and is preferable to using $('.myCheckbox').removeAttr('checked'); since the latter will, if the box was initially checked, change the behaviour of a call to .reset() on any form that contains it ...
how to set a value for a span using JQuery
...
You can do:
$("#submittername").text("testing");
or
$("#submittername").html("testing <b>1 2 3</b>");
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How to sort by two fields in Java?
...es it a bit more clunky to define compared to LINQ.
Here is the full unit test for reference:
@Test
public void testChainedSorting()
{
// Create the collection of people:
ArrayList<Person> people = new ArrayList<>();
people.add(new Person("Dan", 4));
people.add(new Pers...
Error type 3 Error: Activity class {} does not exist
...
May be helpful for someone:--
Sometimes when testing on a device, the app doesn't uninstall properly. To verify and fix this:
Go to Settings.
Go to Apps.
Select your app. (here, you can verify that your app is not uninstalled properly).
Open the overflow menu on the t...
delete vs delete[] operators in C++
...tor delete[] is distinguished but delete operator can release array too.
test* a = new test[100];
delete a;
And already checked this code have no memeory leak.
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