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Removing duplicates from a list of lists
...;>> import itertools
>>> k.sort()
>>> list(k for k,_ in itertools.groupby(k))
[[1, 2], [3], [4], [5, 6, 2]]
itertools often offers the fastest and most powerful solutions to this kind of problems, and is well worth getting intimately familiar with!-)
Edit: as I mention in ...
Wolfram's Rule 34 in XKCD [closed]
... There was also the XKCD strip that listed number of hits for "killed in a __________ accident" (for various activities), and noted something like two hits for "blogging". That number went up very fast after the strip came out.
– David Thornley
Dec 18 '09 at 2...
Why is pow(a, d, n) so much faster than a**d % n?
... +1 that's actually what the docstring implies >>> print pow.__doc__ pow(x, y[, z]) -> number With two arguments, equivalent to x**y. With three arguments, equivalent to (x**y) % z, but may be more efficient (e.g. for longs).
– Hedde van der Heide
...
Do I set properties to nil in dealloc when using ARC?
...
@zeiteisen: No. unsafe_unretained is exactly equivalent to an assign property and is the normal behavior for delegate relationships under MRR, and these need to be nilled out.
– Lily Ballard
Mar 7 '12 at 20:2...
Get bitcoin historical data [closed]
...ocket in higher resolution over longer time period you could use script log_bitstamp_trades.py below.
The script uses python websocket-client and pusher_client_python libraries, so install them.
#!/usr/bin/python
import pusherclient
import time
import logging
import sys
import datetime
import sig...
How to efficiently compare two unordered lists (not sets) in Python?
... objects are not unhashable per se. You just have to implements a sensible __hash__, but that might be impossible for collections.
– Jochen Ritzel
Oct 19 '11 at 22:23
...
Guava equivalent for IOUtils.toString(InputStream)
...se
CharStreams.toString(new InputStreamReader(supplier.get(), Charsets.UTF_8))
This code is problematic because the overload CharStreams.toString(Readable) states:
Does not close the Readable.
This means that your InputStreamReader, and by extension the InputStream returned by supplier.get(...
Pythonic way to combine FOR loop and IF statement
...>>> xyz = [0, 12, 4, 6, 242, 7, 9]
>>>
>>> known_things = sorted(set(a.iterkeys()).intersection(xyz))
>>> unknown_things = sorted(set(xyz).difference(a.iterkeys()))
>>>
>>> for thing in known_things:
... print 'I know about', a[thing]
...
I k...
How can I split and parse a string in Python?
I am trying to split this string in python: 2.7.0_bf4fda703454
3 Answers
3
...
round() for float in C++
...offers a simple set of rounding functions.
#include <boost/math/special_functions/round.hpp>
double a = boost::math::round(1.5); // Yields 2.0
int b = boost::math::iround(1.5); // Yields 2 as an integer
For more information, see the Boost documentation.
Edit: Since C++11, there are std::r...