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In a django model custom save() method, how should you identify a new object?
...exes on other fields). In that case, you could still have a new record in hand, but be unable to save it.
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How to use PyCharm to debug Scrapy projects
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The scrapy command is a python script which means you can start it from inside PyCharm.
When you examine the scrapy binary (which scrapy) you will notice that this is actually a python script:
#!/usr/bin/python
from scrapy.cmdline import...
Is there a way to make mv create the directory to be moved to if it doesn't exist?
So, if I'm in my home directory and I want to move foo.c to ~/bar/baz/foo.c , but those directories don't exist, is there some way to have those directories automatically created, so that you would only have to type
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How to delete (not cut) in Vim?
...register", "_ to really delete something: "_d.
Use "_dP to paste something and keep it available for further pasting.
For the second question, you could use <C-o>dw. <C-o> is used to execute a normal command without leaving the insert mode.
You can setup your own mappings to save typin...
How do I mock a service that returns promise in AngularJS Jasmine unit test?
...= _myService_;
spyOn(myOtherService, "makeRemoteCallReturningPromise").and.callFake(function() {
var deferred = $q.defer();
deferred.resolve('Remote call result');
return deferred.promise;
});
}
it('can do remote call', inject(function() {
myService.makeRemot...
What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?
...e to prepare a little educational tool for SO which should help beginners (and intermediate) programmers to recognize and challenge their unwarranted assumptions in C, C++ and their platforms.
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How to get datetime in JavaScript?
... answered Apr 30 '14 at 17:34
Andrew MaoAndrew Mao
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Can Flask have optional URL parameters?
...d, username):
pass
But I guess that you want to write a single route and mark username as optional? If that's the case, I don't think it's possible.
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Most efficient way to remove special characters from string
...Regular expression: 294.4 ms.
Edit 2:
I added the distinction between A-Z and a-z in the code above. (I reran the performance test, and there is no noticable difference.)
Edit 3:
I tested the lookup+char[] solution, and it runs in about 13 ms.
The price to pay is, of course, the initialization of...
background function in Python
...mes displays images to the user. The images can, at times, be quite large, and they are reused often. Displaying them is not critical, but displaying the message associated with them is. I've got a function that downloads the image needed and saves it locally. Right now it's run inline with the code...