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Django admin: how to sort by one of the custom list_display fields that has no database field
... This certainly should work, but can't mark it as accepted due to extra DB field involved. Also note missing .count() at the end of query-set line.
– mike_k
Feb 2 '10 at 17:08
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What does .class mean in Java?
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object.getClass() returns the class of the given object.
For example:
String string = "hello";
System.out.println(string.getClass().toString());
This will output:
class java.lang.String
This is the class of the string object :)
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Protecting Java Source Code From Being Accessed [closed]
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Extension: In any string literal, replace some blanks with a character that looks like a blank. Like character #255 in ASCII, or the "unwrappable blank" in unicode. Most newbies won´t note the difference, and it will allow you to indiciate wh...
How to change app name per Gradle build type
...l on <application>, the simplest solution is to have that point at a string resource (e.g., android:label="@string/app_name"), then have a different version of that string resource in a src/debug/ sourceset.
You can see that in this sample project, where I have a replacement for app_name in s...
RESTful web service - how to authenticate requests from other services?
...xample "my4wesomeP4ssword!"
11630my4wesomeP4ssword!
Then do MD5 of that string:
05a9d022d621b64096160683f3afe804
When do you call a request, always use this token,
https://mywebservice.com/?token=05a9d022d621b64096160683f3afe804&op=getdata
This token is always unique everyday, so I gues...
Representing null in JSON
...son2 = '{"myCount": null}';
var json3 = '{"myCount": 0}';
var json4 = '{"myString": ""}';
var json5 = '{"myString": "null"}';
var json6 = '{"myArray": []}';
console.log(JSON.parse(json1)); // {}
console.log(JSON.parse(json2)); // {myCount: null}
console.log(JSON.parse(json3)); // {myCount: 0}
conso...
Subset of rows containing NA (missing) values in a chosen column of a data frame
...olumn (in the example it would be column Var2) has there an 'NA' character string (I will replace it with your second statement), then I would like to choose the entire row to be part of the new data frame.
– John
Nov 2 '11 at 14:29
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How to exit a function in bash
...here are definitely solutions possible, but I just wanted to call out that extra care needs to be taken with set -e and returning non-zero values, as that caught me by surprise in the past.
– Yevgeniy Brikman
Jul 12 '19 at 21:19
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Is it safe to parse a /proc/ file?
...ch as mine) implement the proc_read function with a single sprintf(). The extra complication in the core drivers implementation is to handle potentially very long output which may not fit in the intermediate, kernel-space buffer during a single read.
I tested that with a program using a 64K read b...
Trim trailing spaces in Xcode
... in the proper way, I'd settle for about any not-too-intrusive hack. Those extra whitespaces are really annoying.
– Alexander Gladysh
Sep 8 '09 at 12:06
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