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List comprehension vs. lambda + filter
...ue in Python. Even though Guido considered removing map, filter and reduce from Python 3, there was enough of a backlash that in the end only reduce was moved from built-ins to functools.reduce.
Personally I find list comprehensions easier to read. It is more explicit what is happening from the exp...
How do I set environment variables from Java?
How do I set environment variables from Java? I see that I can do this for subprocesses using ProcessBuilder . I have several subprocesses to start, though, so I'd rather modify the current process's environment and let the subprocesses inherit it.
...
How to access SOAP services from iPhone
...on and parsing) to deal with the occasional need to do SOAP style requests from Objective-C. That said, there's a library available called SOAPClient (soapclient) that is open source (BSD licensed) and available on Google Code (mac-soapclient) that might be of interest.
I won't attest to it's abili...
Converting RGB to grayscale/intensity
When converting from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
...
WebAPI Multiple Put/Post parameters
...am trying to post multiple parameters on a WebAPI controller. One param is from the URL, and the other from the body. Here is the url:
/offers/40D5E19D-0CD5-4FBD-92F8-43FDBB475333/prices/
...
OpenSSL: PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE [close
...ecret key would be untrusted, trust only is needed if you exported the key from a keystore, did you?
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Iterating through a range of dates in Python
...unction to completely hide/abstract the iteration over the range of dates:
from datetime import timedelta, date
def daterange(start_date, end_date):
for n in range(int((end_date - start_date).days)):
yield start_date + timedelta(n)
start_date = date(2013, 1, 1)
end_date = date(2015, 6,...
Why use AJAX when WebSockets is available?
...curity, parallelism, error handling, etc). Regarding performance, although from-scratch raw large file transfer speed would be similar, browsers have had years to finely tune caching of web content (much of which applies to AJAX requests) so in practice, switching from AJAX to WebSockets is unlikely...
How do popular apps authenticate user requests from their mobile app to their server?
...n re-request an authentication attempt.
If you hook into the sync adaptor from within the Android Framework that will give you the ability to sync and authenticate all under the hood.
http://developer.android.com/training/sync-adapters/creating-sync-adapter.html
If you check the accounts under S...
Wrapping a C library in Python: C, Cython or ctypes?
I want to call a C library from a Python application. I don't want to wrap the whole API, only the functions and datatypes that are relevant to my case. As I see it, I have three choices:
...