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How to unzip a list of tuples into individual lists? [duplicate]
...icely with the columns, or the transposition of l.
zip() produces tuples; if you must have mutable list objects, just map() the tuples to lists or use a list comprehension to produce a list of lists:
map(list, zip(*l)) # keep it a generator
[list(t) for t in zip(*l)] # consume the zip ge...
Iterating over every two elements in a list
...
It does a different thing. Your version only yields half the number of pairs compared to the itertools recipe function with the same name. Of course yours is faster...
– Sven Marnach
Mar 22 '11 a...
How to loop over files in directory and change path and add suffix to filename
I need to write a script that starts my program with different arguments, but I'm new to Bash. I start my program with:
5 A...
Alternate output format for psql
... | 10304
dda_type | CHECKING
dda_status | PENDING_VERIFICATION
dda_is_deleted | f
dda_verify_op_id | 44938
version | 2
created | 2012-03-06 21:37:50.585845
modified | 2012-03-06 21:37:50.593425
c_id |
dda_nickname |
dd...
Finding all cycles in a directed graph
...
@Gleno Well, if you mean that you can use Tarjan to find all cycles in the graph instead of implementing the rest, you are wrong. Here, you can see the difference between strongly connected components and all cycles (The cycles c-d and g-...
Keyboard Interrupts with python's multiprocessing Pool
...lmost certainly interrupt a condition wait.
Note that this doesn't happen if a timeout is specified; cond.wait(1) will receive the interrupt immediately. So, a workaround is to specify a timeout. To do that, replace
results = pool.map(slowly_square, range(40))
with
results = pool.map_...
EditText, clear focus on touch outside
...fill_parent attributes). Then I used it to intercept touches and determine if the touch was on top of the EditText or not:
FrameLayout touchInterceptor = (FrameLayout)findViewById(R.id.touchInterceptor);
touchInterceptor.setOnTouchListener(new OnTouchListener() {
@Override
public boolean on...
PostgreSQL create table if not exists
...
This feature has been implemented in Postgres 9.1:
CREATE TABLE IF NOT EXISTS myschema.mytable (i integer);
For older versions, here is a function to work around it:
CREATE OR REPLACE FUNCTION create_mytable()
RETURNS void
LANGUAGE plpgsql AS
$func$
BEGIN
IF EXISTS (SELECT FROM ...
Detect permission of camera in iOS
... authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
if(authStatus == AVAuthorizationStatusAuthorized) {
// do your logic
} else if(authStatus == AVAuthorizationStatusDenied){
// denied
} else if(authStatus == AVAuthorizationStatusRestricted){
// restricted, normally won'...
jQuery: Check if div with certain class name exists
...
You can simplify this by checking the first object that is returned from JQuery like so:
if ($(".mydivclass")[0]){
// Do something if class exists
} else {
// Do something if class does not exist
}
In this case if there is a tr...