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Traits vs. interfaces
...
You want to implement a caching system for a web application to cut
down on server load
You start out by writing a class to cache request responses using APC:
class ApcCacher
{
public function fetch($key) {
return apc_fetch($key);
}
public function store($key, $data) {
return...
How to embed a video into GitHub README.md?
...le to embed a flash video into README.md on GitHub? It isn't showing up: https://github.com/mattdipasquale/PicSciP
6 Answ...
How to sum up elements of a C++ vector?
...easurably faster on current Intel x86 CPUs. Also, counting a loop-counter down to zero can save the compiler an instruction in the asm, which can be significant if it doesn't unroll the loop. Prefetching sometimes works slightly better when looping forwards, though, so in general it's not better t...
How do I list all files of a directory?
...les and directories.
If you want just files, you could either filter this down using os.path:
from os import listdir
from os.path import isfile, join
onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))]
or you could use os.walk() which will yield two lists for each directory it vi...
Is there a practical use for weak references? [duplicate]
...t the garbage collector needs to reclaim space, it can do so safely.
The downside is of course that the cleanup policy of the garbage collector is tuned to meet the goals of the whole system, not your specific cache problem. If the GC policy and your desired cache policy are sufficiently aligned t...
Download the Android SDK components for offline install
... find all the list of xml files where packages are available
Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xml
Fetched Add-ons List successfully
Fetching URL: https://dl-ssl.google.com/android/repository/repository-7.xml
Validate XML: https://dl-ssl.google.com/androi...
Running Bash commands in Python
...on error with subprocess.run() is to omit check=True and be surprised when downstream code fails if the subprocess failed.
On the other hand, a common problem with check_call() and check_output() was that users who blindly used these functions were surprised when the exception was raised e.g. when ...
Using the “final” modifier whenever applicable in Java [closed]
... it...
Adding final to all things which should not change simply narrows down the possibilities that you (or the next programmer, working on your code) will misinterpret or misuse the thought process which resulted in your code. At least it should ring some bells when they now want to change your ...
Best practice for Python assert
...hey shouldn't have access to. It wouldn't work, but I want to swiftly shut down their attempt with an assert, so having that optimized away in production would defeat the purpose. I guess I'll just raise an Exception instead. Oh - I just discovered an aptly named SuspiciousOperation Exception with s...
How to grep for two words existing on the same line? [duplicate]
...ge and 'word1' occurs frequently, then you may be passing significant data down the pipe where a single command avoids that overhead. Against that, the regex is more complex; you might need to benchmark it to find out what's best — but only if performance really matters. If you run two commands,...