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Why is “if not someobj:” better than “if someobj == None:” in Python?
... the object has a __nonzero__ special method (as do numeric built-ins, int and float), it calls this method. It must either return a bool value which is then directly used, or an int value that is considered False if equal to zero.
Otherwise, if the object has a __len__ special method (as do contain...
How to check for Is not Null And Is not Empty string in SQL server?
...we check in a SQL Server WHERE condition whether the column is not null and not the empty string ( '' )?
7 Answers
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How to get active user's UserDetails
...ion (like the login or id) stored in the principal or
want to learn how a HandlerMethodArgumentResolver or WebArgumentResolver can solve this in an elegant way, or just want to an learn the background behind @AuthenticationPrincipal and AuthenticationPrincipalArgumentResolver (because it is based on...
The tilde operator in C
I've seen the tilde operator used in the ELF hashing algorithm, and I'm curious what it does. (The code is from Eternally Confused .)
...
HTML input file selection event not firing upon selecting the same file
...the input to null on each onclick event. This will reset the input's value and trigger the onchange event even if the same path is selected.
input.onclick = function () {
this.value = null;
};
input.onchange = function () {
alert(this.value);
};
Here's a DEMO.
Note: It's normal if yo...
jquery ui Dialog: cannot call methods on dialog prior to initialization
...n app on jquery 1.5 with dialogs worked fine.
While I have a lot of .live handlers, I changed this to .on.
For that, I have to update jquery (now 1.8.3 an jquerui 1.9.1).
...
Adding a directory to the PATH environment variable in Windows
... these values. A new process will do so if it is started after this change and doesn't inherit the old environment from its parent.
You didn't specify how you started the console session. The best way to ensure this is to exit the command shell and run it again. It should then inherit the updated PA...
Difference between web reference and service reference?
What is the difference between web reference and service reference in WCF?
Which is preferable in WCF?
5 Answers
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What are the differences between vector and list data types in R?
What are the main differences between vector and list data types in R? What are the advantages or disadvantages of using (or not) these two data types?
...
Inline SVG in CSS
...rk nicely is Safari (5.1.4). In Opera 11.62 the gradient is black, in IE 9 and Firefox 12 it's white. In Chrome 19, it works UNLESS you specify the width/height of the SVG in % units. I'd say it's more of an oddity than a real feature. It's a cool find though.
– toniedzwiedz
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