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How do I get the number of elements in a list?
...erator)
3
But length_hint is by definition only a "hint", so most of the time len is better.
I've seen several answers suggesting accessing __len__. This is all right when dealing with built-in classes like list, but it could lead to problems with custom classes, because len (and length_hint) imp...
Java Try Catch Finally blocks without Catch
...ause of a throw of a value V, then there is a choice:
If the run-time type of V is assignable to the parameter of any catch clause of the try statement, then …
…
If the run-time type of V is not assignable to the parameter of any catch clause of the try statement, then the finall...
How to set environment variables in Python?
...est values.
Excerpt from the docs:
This mapping is captured the first time the os module is imported,
typically during Python startup as part of processing site.py. Changes
to the environment made after this time are not reflected in
os.environ, except for changes made by modifying os.env...
How do you see recent SVN log entries?
...ice - shows most recent at the top. And better than TortoiseSVN's 100-at-a-time paging! When you want to go further back.
– Tomasz Gandor
Nov 14 '12 at 20:42
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Catch a thread's exception in the caller thread in Python
...in a new outer exception, and get both stack traces with
six.raise_from(RuntimeError('Exception in thread'),self.exc)
or
raise RuntimeError('Exception in thread') from self.exc
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How to save an image locally using Python whose URL address I already know?
...port shutil
import requests
from urlparse import urljoin
import sys
import time
def make_soup(url):
req = urllib2.Request(url, headers={'User-Agent' : "Magic Browser"})
html = urllib2.urlopen(req)
return BeautifulSoup(html, 'html.parser')
def get_images(url):
soup = make_soup(url)...
NSUserDefaults not cleared after app uninstall on simulator
this may sound real NOOB! I want to check if it's the second time the user enters my application, so to keep the run count I'm using NSUserDefaults . I have implemented the following code in my rootViewController 's viewDidLoad method:
...
PHP 5.4 Call-time pass-by-reference - Easy fix available?
...nt by reference. As of PHP 5.3.0, you will get a warning saying that "call-time pass-by-reference" is deprecated when you use & in foo(&$a);.
For example, instead of using:
// Wrong way!
myFunc(&$arg); # Deprecated pass-by-reference argument
function myFunc($arg) { }
U...
How to parse unix timestamp to time.Time
I'm trying to parse an Unix timestamp but I get out of range error. That doesn't really makes sense to me, because the layout is correct (as in the Go docs):
...
How do I schedule jobs in Jenkins?
...H H * * * would still execute each job once a day, but not all at the same time, better using limited resources.
Note also that:
The H symbol can be thought of as a random value over a range, but it actually is a hash of the job name, not a random function, so that the value remains stable for any...