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In Jinja2, how do you test if a variable is undefined?
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edited Jul 29 '14 at 0:16
Day
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answered Oct ...
How do I build a numpy array from a generator?
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130
Numpy arrays require their length to be set explicitly at creation time, unlike python lists. Th...
Random row selection in Pandas dataframe
...me(x, n):
return x.ix[random.sample(x.index, n)]
Note: As of Pandas v0.20.0, ix has been deprecated in favour of loc for label based indexing.
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Enable access control on simple HTTP server
...stHandler, HTTPServer, port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000)
Python 2 solution
Python 2 uses SimpleHTTPServer.SimpleHTTPRequestHandler and the BaseHTTPServer module to run the server.
#!/usr/bin/env python2
from SimpleHTTPServer import SimpleHTTPRequestHandler
import BaseHTTPS...
jQuery: checking if the value of a field is null (empty)
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170
The value of a field can not be null, it's always a string value.
The code will check if the st...
What is %2C in a URL?
...hr | Hx | Chr | Hx | Chr |
+----+-----+----+-----+----+-----+----+-----+
| 00 | NUL | 20 | SPC | 40 | @ | 60 | ` |
| 01 | SOH | 21 | ! | 41 | A | 61 | a |
| 02 | STX | 22 | " | 42 | B | 62 | b |
| 03 | ETX | 23 | # | 43 | C | 63 | c |
| 04 | EOT | 24 | $ | 44 | D | 64 | d ...
How do Trigonometric functions work?
... a standard interval. For starters, you could reduce angles to be between 0 and 360 degrees. But by using a few identities, you realize you could get by with less. If you calculate sines and cosines for angles between 0 and 45 degrees, you can bootstrap your way to calculating all trig functions f...
get list of pandas dataframe columns based on data type
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320
If you want a list of columns of a certain type, you can use groupby:
>>> df = pd.Data...
How to remove an item for a OR'd enum?
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edited Aug 9 '16 at 20:53
David Sherret
74.1k2222 gold badges149149 silver badges154154 bronze badges
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Test parameterization in xUnit.net similar to NUnit
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xUnit offers a way to run parameterized tests through something called data theories. The concep...