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How to get last items of a list in Python?
...the python CLI interpreter:
>>> a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a[-9:]
[4, 5, 6, 7, 8, 9, 10, 11, 12]
the important line is a[-9:]
s...
SQL Add foreign key to existing column
If I am using the following SQL command in SQL Server 2008 to update a table with a foreign key constraint:
6 Answers
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Applying function with multiple arguments to create a new pandas column
...n:
>>> import numpy as np
>>> df = pd.DataFrame({"A": [10,20,30], "B": [20, 30, 10]})
>>> df['new_column'] = np.multiply(df['A'], df['B'])
>>> df
A B new_column
0 10 20 200
1 20 30 600
2 30 10 300
or vectorize arbitrary func...
How to suppress warnings globally in an R Script
...lly might not be a good idea.
To turn warnings back on, use
options(warn=0)
(or whatever your default is for warn, see this answer)
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How to resize an image to fit in the browser window?
...
Update 2018-04-11
Here's a Javascript-less, CSS-only solution. The image will dynamically be centered and resized to fit the window.
<html>
<head>
<style>
* {
margin: 0;
padding...
Wget output document and headers to STDOUT
...stJoseph Lust
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Remove the first character of a string
... |
edited Jul 8 '18 at 19:00
Bjamse
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answered Feb 9 '11 at 13:34
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Generating an MD5 checksum of a file
...fit the whole file in memory. In that case, you'll have to read chunks of 4096 bytes sequentially and feed them to the md5 method:
import hashlib
def md5(fname):
hash_md5 = hashlib.md5()
with open(fname, "rb") as f:
for chunk in iter(lambda: f.read(4096), b""):
hash_md5....
How do I get the directory that a program is running from?
...ytes = MIN(readlink("/proc/self/exe", pBuf, len), len - 1);
if(bytes >= 0)
pBuf[bytes] = '\0';
return bytes;
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python's re: return True if string contains regex pattern
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mattbornskimattbornski
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