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How do I design a class in Python?
...function so that it only happens once. Something like:
class Dog:
def __init__(self):
self._footsteps=None
def footstep(self,n):
if not self._footsteps:
self.readInFootsteps(...)
return self._footsteps[n]
[This is now a sort of caching pattern. The first time it goe...
Ruby Bundle Symbol not found: _SSLv2_client_method (LoadError)
... ruby-1.9.3-p547
Ruby gets re-installed, but fails in setting up a gemset_pristine for the application because
libv8 version 3.16.14.3 failed
which was the reason I got to this point in the first place. Vicious frustration circle...
update
Check your platform version. I have for example Darwin...
How to parse unix timestamp to time.Time
...ut:
2014-07-16 20:55:46 +0000 UTC
Playground: http://play.golang.org/p/v_j6UIro7a
Edit:
Changed from strconv.Atoi to strconv.ParseInt to avoid int overflows on 32 bit systems.
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How to convert JSON string to array
...
If you pass the JSON in your post to json_decode, it will fail. Valid JSON strings have quoted keys:
json_decode('{foo:"bar"}'); // this fails
json_decode('{"foo":"bar"}', true); // returns array("foo" => "bar")
json_decode('{"foo":"bar"}'); // ret...
How to update a record using sequelize for node?
...
Project.update(
{ title: 'a very different title now' },
{ where: { _id: 1 } }
)
.success(result =>
handleResult(result)
)
.error(err =>
handleError(err)
)
Update 2016-03-09
The latest version actually doesn't use success and error anymore but instead uses then-able...
How to print out the method name and line number and conditionally disable NSLog?
...lot:
#ifdef DEBUG
# define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
#else
# define DLog(...)
#endif
// ALog always displays output regardless of the DEBUG setting
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE_...
Web-scraping JavaScript page with Python
...:
import requests
from bs4 import BeautifulSoup
response = requests.get(my_url)
soup = BeautifulSoup(response.text)
soup.find(id="intro-text")
# Result:
<p id="intro-text">No javascript support</p>
Scraping with JS support:
from selenium import webdriver
driver = webdriver.PhantomJS(...
Find running median from a stream of integers
...t running median with O(lg n) updates where n is the window size'
def __init__(self, n, iterable):
self.it = iter(iterable)
self.queue = deque(islice(self.it, n))
self.skiplist = IndexableSkiplist(n)
for elem in self.queue:
self.skiplist.insert(elem)
...
How can strings be concatenated?
...
The easiest way would be
Section = 'Sec_' + Section
But for efficiency, see: https://waymoot.org/home/python_string/
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Difference between global and device functions
Can anyone describe the differences between __global__ and __device__ ?
9 Answers
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