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What is the most efficient way of finding all the factors of a number in Python?
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from functools import reduce
def factors(n):
return set(reduce(list.__add__,
([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))
This will return all of the factors, very quickly, of a n...
What does SynchronizationContext do?
... builds) throw an exception, telling you that you may not access myTextBox from across another thread.
This is why you have to somehow "switch back" from the worker thread to the "UI thread" (where myTextBox was created) before that particular assignment. This is done as follows:
While you are stil...
Merging: Hg/Git vs. SVN
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I do not use Subversion myself, but from the release notes for Subversion 1.5: Merge tracking (foundational) it looks like there are the following differences from how merge tracking work in full-DAG version control systems like Git or Mercurial.
Merging trun...
How to merge 2 List and removing duplicate values from it in C#
...ists List that I need to combine in third list and remove duplicate values from that lists
5 Answers
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How do I convert a numpy array to (and display) an image?
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You could use PIL to create (and display) an image:
from PIL import Image
import numpy as np
w, h = 512, 512
data = np.zeros((h, w, 3), dtype=np.uint8)
data[0:256, 0:256] = [255, 0, 0] # red patch in upper left
img = Image.fromarray(data, 'RGB')
img.save('my.png')
img.show()
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Generate random numbers using C++11 random library
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Stephan T. Lavavej (stl) from Microsoft did a talk at Going Native about how to use the new C++11 random functions and why not to use rand(). In it, he included a slide that basically solves your question. I've copied the code from that slide below.
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How to store standard error in a variable
...direction over the enclosed commands. As written, it would capture errors from sed too.
WARNING: Formally untested code - use at own risk.
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How to send email via Django?
...her use an external service like Sendgrid, or you can follow this tutorial from Google to reduce security but allow this option: https://support.google.com/accounts/answer/6010255
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Rest with Express.js nested router
...s {mergeParams: true} to the child router if you want to access the params from the parent router.
mergeParams was introduced in Express 4.5.0 (Jul 5 2014)
In this example the itemRouter gets attached to the userRouter on the /:userId/items route
This will result in following possible routes:
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How to use font-awesome icons from node-modules
...k lines of unminified CSS.
You'll also need to serve the fonts themselves from a folder called/fonts/ in your public directory. You could just copy them there with a simple gulp task, for example:
gulp.task('fonts', function() {
return gulp.src('node_modules/font-awesome/fonts/*')
.pipe(gul...