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What are some (concrete) use-cases for metaclasses?
...ment the figure count, call draw manually, etc, but I needed to do these before and after every plotting call. So to create both an interactive plotting wrapper and an offscreen plotting wrapper, I found it was more efficient to do this via metaclasses, wrapping the appropriate methods, than to do ...
awk without printing newline
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printf "%s",whatever You forgot the comma. You can also extend with more variables and separate them with a comma.
– Hielke Walinga
Aug 7 '18 at 11:27
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What is the definition of “interface” in object oriented programming
Ok, a friend of mine go back and forth on what "interface" means in programming.
16 Answers
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What is the difference between String.Empty and “” (empty string)?
...ast as .Length == 0.
.Length == 0 is the fastest option, but .Empty makes for slightly cleaner code.
See the .NET specification for more information.
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Getting a random value from a JavaScript array
... plan on getting a random value a lot, you might want to define a function for it.
First, put this in your code somewhere:
Array.prototype.sample = function(){
return this[Math.floor(Math.random()*this.length)];
}
Now:
[1,2,3,4].sample() //=> a random element
Code released into the public do...
Python json.loads shows ValueError: Extra data
...ou can just read from a file, jsonifying each line as you go:
tweets = []
for line in open('tweets.json', 'r'):
tweets.append(json.loads(line))
This avoids storing intermediate python objects. As long as your write one full tweet per append() call, this should work.
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Python dictionary from an object's fields
...s level and your attributes at instance level, so __dict__ should be fine. For example:
>>> class A(object):
... def __init__(self):
... self.b = 1
... self.c = 2
... def do_nothing(self):
... pass
...
>>> a = A()
>>> a.__dict__
{'c': 2, 'b': 1}
A better...
Select mySQL based only on month and year
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Is this true for EXTRACT(YEAR_MONTH FROM Date)?
– cmbuckley
Feb 1 '12 at 23:59
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How to abandon a hg merge?
...mitted will be gone!
After that you should probably use some kind of code formatter tool to do the entire operation, or at least some find and replace with regular expressions. Something as simple as replacing what matches ^____ (use 4 spaces instead of underscores) with __ (2 spaces), repeated a f...
Why does modern Perl avoid UTF-8 by default?
...at you are running perl version 5.12 or better via:
use v5.12; # minimal for unicode string feature
use v5.14; # optimal for unicode string feature
Enable warnings, since the previous declaration only enables strictures and features, not warnings. I also suggest promoting Unicode warnings into e...