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Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
... a pointer to a double has to be explicitly signalled to scanf as distinct from a pointer to float, because what the pointer points to is what matters.
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How can I assign the output of a function to a variable using bash?
...ocal builtin will accept any options that the declare builtin will accept. from a quick test, it also looks as if declare -n in a function scope also gives the variable local scope. it seems they are interchangeable here.
– init_js
Sep 6 '17 at 19:58
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How to write string literals in python without having to escape them?
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(Assuming you are not required to input the string from directly within Python code)
to get around the Issue Andrew Dalke pointed out, simply type the literal string into a text file and then use this;
input_ = '/directory_of_text_file/your_text_file.txt'
input_open = op...
Multiple ModelAdmins/views for same model in Django admin
...y great! Just to add, for Django 1.4.5 I needed to inherit my custom class from admin.ModelAdmin
class MyPostAdmin(admin.ModelAdmin):
def queryset(self, request):
return self.model.objects.filter(id=1)
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Use curly braces to initialize a Set in Python
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From Python 3 documentation (the same holds for python 2.7):
Curly braces or the set() function can be used to create sets. Note:
to create an empty set you have to use set(), not {}; the latter
creates an empty dicti...
Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
... machine and this is one of the places where that abstraction is leaking.
From the perspective of the computer, a function is just a memory address which, if executed, performs other instructions. So a function in C is itself modelled as an address, which probably leads to the design that a functio...
Reference assignment operator in PHP, =&
... = &$someVar (ampersand dollar sign variable name). Example simplified from the docs:
$a = 3;
$b = &$a;
$a = 4;
print "$b"; // prints 4
Here's a handy link to a detailed section on Assign By Reference in the PHP manual. That page is part of a series on references - it's worth taking a m...
Position: absolute and parent height?
...lutely positioned.
Absolutely positioned elements are completely removed from the document flow, and thus their dimensions cannot alter the dimensions of their parents.
If you really had to achieve this affect while keeping the children as position: absolute, you could do so with JavaScript by fi...
Track the time a command takes in UNIX/LINUX?
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Note that using /usr/bin/time prevents you from using bash aliases. The bash builtin time is needed for that, else you'll get the error cannot run my_alias: No such file or directory.
– Jamie S
Sep 20 '18 at 17:28
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Why define an anonymous function and pass it jQuery as the argument?
I'm looking through the excellent peepcode demo code from the backbone.js screencasts. In it, the backbone code is all enclosed in an anonymous function that is passed the jQuery object:
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