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How do I tell matplotlib that I am done with a plot?
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@JouniK.Seppänen Just to add to your comment, Python will by default warn you if you open many figures: "RuntimeWarning: More than 20 figures have been opened.".
– rph
Sep 14 '18 at 5:26
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Embedding Base64 Images
...l to encode to base64. Instead you can use the base64 command line tool on Linux or Mac OS X: echo "data:image/jpeg;base64,"$(cat file.jpg | base64)
– cstroe
Sep 14 '18 at 4:42
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How do I install g++ for Fedora?
How do I install g++ for Fedora Linux? I have been searching the dnf command to install g++ but didn't find anything.
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How efficient is locking an unlocked mutex? What is the cost of a mutex?
..., that mostly answers my question. I didn't knew that the kernel (e.g. the Linux kernel) handles mutexes and you control them via syscalls. But as the Linux itself manages the scheduling and context switches, this makes sense. But now I have a rough imagination about what the mutex lock/unlock will ...
How do you rotate a two dimensional array?
...tipping” the matrix onto its right side. We want to write a function, in Python, that takes a matrix and rotates in once to the right. The function signature will be:
def rotate(matrix):
# Algorithm goes here.
The matrix will be defined using a two-dimensional array:
matrix = [
[0,1],
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Calculate distance between two latitude-longitude points? (Haversine formula)
...h my jsPerf and see the results here.
Recently I needed to do the same in python, so here is a python implementation:
from math import cos, asin, sqrt, pi
def distance(lat1, lon1, lat2, lon2):
p = pi/180
a = 0.5 - cos((lat2-lat1)*p)/2 + cos(lat1*p) * cos(lat2*p) * (1-cos((lon2-lon1)*p))/2...
How do you sort a list in Jinja2?
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Ok, thanks. I did end up sorting in Python before sending to template: <code>movie_list = sorted( movie_list, key = lambda movie:movie.rating, reverse = True )</code> Too bad, it might be nice to let the template decide on the sort order! ( could ...
Git for beginners: The definitive practical guide
...stributed version control system Git
and runs on Windows, Mac OS X and
Linux. SmartGit is intended for
developers who prefer a graphical user
interface over a command line client,
to be even more productive with Git —
the most powerful DVCS today.
You can download it from their websi...
Selenium wait until document is ready
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Here's my attempt at a completely generic solution, in Python:
First, a generic "wait" function (use a WebDriverWait if you like, I find them ugly):
def wait_for(condition_function):
start_time = time.time()
while time.time() < start_time + 3:
if condition_fu...
Expression Versus Statement
...ction can iclude unless the language only allows for limited lambdas, like Python's single-expression lambdas.
In an expression-based language, all you need is a single expression for a function since all control structures return a value (a lot of them return NIL). There's no need for a return st...