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Python: changing value in a tuple
...ples (on Python 3.3), concatenation is actually faster!
In [3]: d = tuple(range(10))
In [4]: %timeit replace_at_index1(d, 5, 99)
1000000 loops, best of 3: 872 ns per loop
In [5]: %timeit replace_at_index2(d, 5, 99)
1000000 loops, best of 3: 642 ns per loop
Yet if we look at longer tuples, list ...
How to calculate moving average using NumPy?
...[n:] = ret[n:] - ret[:-n]
return ret[n - 1:] / n
>>> a = np.arange(20)
>>> moving_average(a)
array([ 1., 2., 3., 4., 5., 6., 7., 8., 9., 10., 11.,
12., 13., 14., 15., 16., 17., 18.])
>>> moving_average(a, n=4)
array([ 1.5, 2.5, 3....
Asynchronous method call in Python?
...ss pool must be created inside __main__.
async.pool = Pool(4)
p = range(0, 1000)
results = []
for i in range(4):
result = printsum(i, sample(p, 100))
results.append(result)
for result in results:
print("Worker %i: sum value is %i" % result.get())
In a ...
Regular Expression for alphanumeric and underscores
...ntation at the above links states that \w will "Match any character in the range 0 - 9, A - Z and a - z (equivalent of POSIX [:alnum:])", I have not found this to be true. Not with grep -P anyway. You need to explicitly include the underscore if you use [:alnum:] but not if you use \w. You can't bea...
Is there a difference between “==” and “is”?
...s out the reference implementation of Python caches integer objects in the range -5..256 as singleton instances for performance reasons. Here's an example demonstrating this:
>>> for i in range(250, 260): a = i; print "%i: %s" % (i, a is int(str(i)));
...
250: True
251: True
252: True
253...
Insert picture into Excel cell [closed]
...s the ALT key and then move the picture with the mouse. It will
snap and arrange itself with the border of the cell as soon it comes
close to it.
If you have multiple images, you can select and insert all the images at once (as shown in step 4).
You can also resize images by selecting it and dr...
How to check if an object is a generator object in python?
...pes.GeneratorType
<class 'generator'>
>>> gen = (i for i in range(10))
>>> isinstance(gen, types.GeneratorType)
True
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Calculate the median of a billion numbers
...erform a modified merge, in which it finds the least of all those top-of-a-range values, then tells all the sorting machines what it was, so that they can (a) tell the control machine how many values to "count" below that value, and (b) resume sending their sorted data from that point.
More general...
Set Django IntegerField by choices=… name
...:
if not hasattr(choices[0],'__iter__'):
choices = zip(range(len(choices)), choices)
self.val2choice = dict(choices)
self.choice2val = dict((v,k) for k,v in choices)
kwargs['choices'] = choices
super(models.IntegerField, self).__init__(**kwargs)
...
Are there any standard exit status codes in Linux?
...rgument to exit
128+n: Fatal error signal "n"
255: Exit status out of range (exit takes only integer args in the range 0 - 255)
Part 2: sysexits.h
The ABSG references sysexits.h.
On Linux:
$ find /usr -name sysexits.h
/usr/include/sysexits.h
$ cat /usr/include/sysexits.h
/*
* Copyright (...