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What is the fastest way to check if a class has a function defined?
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arogachev
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answered Mar 11 '11 at 2:54
Nathan OstgardNathan Ostgard
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Python 3 ImportError: No module named 'ConfigParser'
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edited Apr 13 '16 at 12:10
Mark Amery
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an...
Is multiplication and division using shift operators in C actually faster?
Multiplication and division can be achieved using bit operators, for example
19 Answers
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Why should hash functions use a prime number modulus?
...ily optimized by the CPU as a (x*32)-1 operation, in which *32 is a simple bit shift, or even better an immediate address scale factor (e.g. lea eax,eax*8; leax, eax,eax*4 on x86/x64). So *31 is a good candidate for prime number multiplication. This was pretty much true some years ago - now latest C...
How does `is_base_of` work?
How does the following code work?
5 Answers
5
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Java naming convention for static final variables [duplicate]
...that represent alternative values of a set, or,
less frequently, masking bits in an integer value, are sometimes
usefully specified with a common acronym as a name prefix, as in:
interface ProcessStates {
int PS_RUNNING = 0;
int PS_SUSPENDED = 1;
}
Obscuring involving constant names i...
How to add an extra column to a NumPy array
...olution and faster to boot is to do the following:
import numpy as np
N = 10
a = np.random.rand(N,N)
b = np.zeros((N,N+1))
b[:,:-1] = a
And timings:
In [23]: N = 10
In [24]: a = np.random.rand(N,N)
In [25]: %timeit b = np.hstack((a,np.zeros((a.shape[0],1))))
10000 loops, best of 3: 19.6 us per...
Find nearest value in numpy array
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With slight modification, the answer above works with arrays of arbitrary dimension (1d, 2d, 3d, ...):
def find_nearest(a, a0):
"Element in nd array `a` closest to the scalar value `a0`"
idx = np.abs(a - a0).argmin()
return a.flat[idx]
Or, written as a single line:
a.flat[np...
Can I redirect the stdout in python into some sort of string buffer?
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# THIS WORKS AS HELL: as Bob Stein proposed years ago:
# py2 SURPRISEDaBIT:
#
import io
import sys
#
real_stdout = sys.stdout # PUSH <stdout> ( store to REAL_ )
fake_stdout = io.BytesIO() # .DEF FAKE_
try: ...
How to run a PowerShell script without displaying a window?
How is it possible to run a PowerShell script without displaying a window or any other sign to the user?
11 Answers
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