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How do I check (at runtime) if one class is a subclass of another?
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Subclass testing makes unit testing of many things, particularly Django's models, much easier. "Python is not Java." Why must python programmers have such chips on their shoulders?
– Michael Bacon
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How to check if running in Cygwin, Mac or Linux?
...GW64_NT" ]; then
# Do something under 64 bits Windows NT platform
fi
Testing
Linux (Ubuntu 12.04 LTS, Kernel 3.2.0) tested OK.
OS X (10.6.8 Snow Leopard) tested OK.
Windows (Windows 7 64 bit) tested OK.
What I learned
Check for both opening and closing quotes.
Check for missing parenthes...
how to permit an array with strong parameters
...me, DateTime, StringIO, IO,
ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile.
To declare that the value in params must be an array of permitted scalar values map the key to an empty array:
params.permit(:id => [])
In my app, the category_ids are passed to the create acti...
New line in text area
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try this.. it works:
<textarea id="test" cols='60' rows='8'>This is my statement one.&#10;This is my statement2</textarea>
replacing for tags:
$("textarea#test").val(replace($("textarea#test").val(), "<br>", "&#10;")));
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Read .mat files in Python
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First save the .mat file as:
save('test.mat', '-v7')
After that, in Python, use the usual loadmat function:
import scipy.io as sio
test = sio.loadmat('test.mat')
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Progress indicator during pandas operations
... internally..
here's the code from my gist (I'll add more pandas function tests there):
import pandas as pd
import numpy as np
import multiprocessing
from functools import partial
def _df_split(tup_arg, **kwargs):
split_ind, df_split, df_f_name = tup_arg
return (split_ind, getattr(df_spli...
What is the use of “ref” for reference-type variables in C#?
...wap<T>(ref T x, ref T y) {
T t = x;
x = y;
y = t;
}
var test = new[] { "0", "1" };
Swap(ref test[0], ref test[1]);
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How to create a numpy array of all True or all False?
...en the np.full and np.ones version.
Answer: No
import timeit
n_array, n_test = 1000, 10000
setup = f"import numpy as np; n = {n_array};"
print(f"np.ones: {timeit.timeit('np.ones((n, n), dtype=bool)', number=n_test, setup=setup)}s")
print(f"np.full: {timeit.timeit('np.full((n, n), True)', number=...
Maximum concurrent Socket.IO connections
...enchmarking/
I wondered the same question, so I ended up writing a small test (using XHR-polling) to see when the connections started to fail (or fall behind). I found (in my case) that the sockets started acting up at around 1400-1800 concurrent connections.
This is a short gist I made, similar ...
How to “inverse match” with regex?
...e it is written in, but worked like a charm in Sublime text to clean up my test data. Thanks!
– Matthias dirickx
May 4 '17 at 11:21
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