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nonlocal keyword in Python 2.x
...a dec() returned from outer that increment and decrement a shared counter. Then you have to decide which function to attach the current counter value to and reference that function from the other one(s). Which looks somewhat strange and asymmetrical. E.g. in dec() a line like inc.value -= 1.
...
Identify user in a Bash script called by sudo
...are using sudo su -.
It also requires multiple checks - if $USER == 'root' then get $SUDO_USER.
Instead of the command whoami use who am i. This runs the who command filtered for the current session. It gives you more info than you need. So, do this to get just the user:
who am i | awk '{print...
How does the getView() method work when creating your own custom adapter?
...last used view to draw an item. In getView() you inflate the xml first and then use findByViewID() to get the various UI elements of the listitem. When we check for (convertView == null) what we do is check that if a view is null(for the first item) then create it, else, if it already exists, reuse ...
Error 'LINK : fatal error LNK1123: failure during conversion to COFF: file invalid or corrupt' after
...oesn't work for you, and turning off "Embed Manifest" doesn't work either, then search your path for multiple versions of CVTRES.exe.
By debugging with the /VERBOSE linker option I found the linker was writing that error message when it tried to invoke cvtres and it failed.
It turned out that I ha...
Where does forever store console.log output?
...ys a random file. If you specified a uid with the --uid flag when starting then it will create a log file using the specified uid.
– ddelrio1986
Mar 5 '15 at 16:41
add a comme...
Unique fields that allow nulls in Django
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If bar is blank then replace it with None in pre_save method. Code will be more DRY I suppose.
– Ashish Gupta
Dec 12 '15 at 10:52
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How to initialize a private static const map in C++?
...tries that are known at compile time and the keys to the map are integers, then you do not need to use a map at all.
char get_value(int key)
{
switch (key)
{
case 1:
return 'a';
case 2:
return 'b';
case 3:
return 'c';
defau...
What does the 'static' keyword do in a class?
... If the static member of a class is referenced by 2 different threads then how many instances are there of that static member? I feel like it's 2 but if you want the same instance across threads then the volatile keyword has to be used. Is that correct?
– Dan
...
Android - Pulling SQlite database android device
...p data, including it's database, without root by using adb backup command, then extract the backup file and access the sqlite database.
First backup app data to your PC via USB cable with the following command, replace app.package.name with the actual package name of the application.
adb backup -f...
Remove elements from collection while iterating
...tion to determine what elements you want to add to a second collection and then issue an addAll method at the end.
Using ListIterator
If you are working with lists, another technique consists in using a ListIterator which has support for removal and addition of items during the iteration itself.
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