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What is the pythonic way to avoid default parameters that are empty lists?
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def my_func(working_list=None):
if working_list is None:
working_list = []
working_list.append("a")
print(working_list)
The docs say you should use None as the default and explicitly test for it in the body ...
How do I search for an object by its ObjectId in the mongo console?
...est.find() // no criteria
{ "_id" : ObjectId("4ecc05e55dd98a436ddcc47c"), "x" : 1 }
> db.test.find({"_id" : ObjectId("4ecc05e55dd98a436ddcc47c")}) // explicit
{ "_id" : ObjectId("4ecc05e55dd98a436ddcc47c"), "x" : 1 }
> db.test.find(ObjectId...
GPU Emulator for CUDA programming without the hardware [closed]
...nstalled it and tried to run a simple
program:
#include <stdio.h>
__global__ void helloWorld() {
printf("Hello world! I am %d (Warp %d) from %d.\n",
threadIdx.x, threadIdx.x / warpSize, blockIdx.x);
}
int main() {
int blocks, threads;
scanf("%d%d", &blocks, &thr...
How to manually create icns files using iconutil?
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The following files should exist: icon_16x16.png, icon_16x16@2x.png, icon_32x32.png, icon_32x32@2x.png, icon_128x128.png, icon_128x128@2x.png, icon_256x256.png, icon_256x256@2x.png. The @2x files should be stored at 144 pixels per inch while the others should be...
Sequence contains no matching element
...'d expect it's this line that's throwing the exception:
var documentRow = _dsACL.Documents.First(o => o.ID == id)
First() will throw an exception if it can't find any matching elements. Given that you're testing for null immediately afterwards, it sounds like you want FirstOrDefault(), which r...
How to check an Android device is HDPI screen or MDPI screen?
... Density values described at: developer.android.com/guide/practices/screens_support.html
– esilver
Jan 21 '14 at 21:52
1
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ORA-12514 TNS:listener does not currently know of service requested in connect descriptor
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I had this issue and the fix was to make sure in tnsnames.ora the SERVICE_NAME is a valid service name in your database. To find out valid service names, you can use the following query in oracle:
select value from v$parameter where name='service_names'
Once I updated tnsnames.ora to:
TEST =
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What's wrong with using $_REQUEST[]?
I've seen a number of posts on here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
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JavaScript open in a new window, not tab
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You don't need to use height, just make sure you use _blank, Without it, it opens in a new tab.
For a empty window:
window.open('', '_blank', 'toolbar=0,location=0,menubar=0');
For a specific URL:
window.open('http://www.google.com', '_blank', 'toolbar=0,location=0,menuba...
How to get the Power of some Integer in Swift language?
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func p(_ b: Bool) -> Double { return b?-1:1 } ?
– Grimxn
Sep 23 '16 at 5:50
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