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Why are mutable structs “evil”?
...ay[500] of type Rectangle, it's clear and obvious how to e.g. copy element 123 to element 456 and then some time later set the width of element 123 to 555, without disturbing element 456. "RectArray[432] = RectArray[321]; ...; RectArray[123].Width = 555;". Knowing that Rectangle is a struct with a...
What's the equivalent of use-commit-times for git?
...he long answer was:
I think you're much better off just using multiple repositories instead, if this is something common.
Messing with timestamps is not going to work in general. It's just going to guarantee you that "make" gets confused in a really bad way, and does not recompile enough instead ...
How do I do an OR filter in a Django query?
...s, but a bit simpler, without the lambda:
filter_kwargs = {
'field_a': 123,
'field_b__in': (3, 4, 5, ),
}
To filter these two conditions using OR:
Item.objects.filter(Q(field_a=123) | Q(field_b__in=(3, 4, 5, ))
To get the same result programmatically:
list_of_Q = [Q(**{key: val}) for key, ...
Remove shadow below actionbar
...o be compatible with all previous devices?
– splinter123
Mar 22 '15 at 22:05
same as @splinter123 here :( Wonder how I...
How to run a python script from IDLE interactive shell?
...ipt name
execfile('helloworld.py')
Deprecated since 2.6: popen
import os
os.popen('python helloworld.py') # Just run the program
os.popen('python helloworld.py').read() # Also gets you the stdout
With arguments:
os.popen('python helloworld.py arg').read()
Advance usage: subprocess
impor...
How to convert an enum type variable to a string?
... execute that debug code: it then gives you the wrong information, so you lose half a day building assumptions based on this wrong information, before realizing you first had to debug the debug code: the design relies on explicit duplication.
– Ad N
Aug 20 '15 ...
Where can I find “make” program for Mac OS X Lion?
Just upgraded my computer to Mac OS X Lion and went to terminal and typed "make" but it says:
-bash: make: command not found
...
Git Alias - Multiple Commands and Parameters
...performing redirections and return the status 0. Here're some usages: 1. a=123;$a errors, but a=123; : $a does not. 2. : > hello.txt empties hello.txt. 3. if [ "$a" = "hello" ];then : ;fi runs okay but errors without ':'. It's like pass in python. 4. : this is a comment, the colon followed by spa...
Import multiple csv files into pandas and concatenate into one DataFrame
...like an old fashioned aka manual way of doing things, esp. as the Hapood ecosystem has growing list of tools where you can perform sql queries directly on many different directories containing different file types (csv, json, txt, databases) as if it was one data source. There must be something si...
uint8_t can't be printed with cout
...
It doesn't really print a blank, but most probably the ASCII character with value 5, which is non-printable (or invisible). There's a number of invisible ASCII character codes, most of them below value 32, which is the blank actually.
You have to convert aa to u...