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How do you run a command for each line of a file?
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Read a file line by line and execute commands: 4 answers
This is because there is not only 1 answer...
shell command line expansion
xargs dedicated tool
while read with some remarks
while read -u using dedicated fd, for interactive processing (sample)
Regarding the O...
How can I make an “are you sure” prompt in a Windows batchfile?
... selected choice.
– isapir
Dec 26 '14 at 21:05
4
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What is memoization and how can I use it in Python?
...Memoize(factorial)
A feature known as "decorators" was added in Python 2.4 which allow you to now simply write the following to accomplish the same thing:
@Memoize
def factorial(k):
if k < 2: return 1
return k * factorial(k - 1)
The Python Decorator Library has a similar decorator ca...
When do I use the PHP constant “PHP_EOL”?
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edited Feb 21 '18 at 14:02
Félix Gagnon-Grenier
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Linux command to list all available commands and aliases
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answered Jun 4 '09 at 7:07
camhcamh
34.5k1111 gold badges5454 silver badges6262 bronze badges
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Pandas get topmost n records within each group
... value
id
1 0 1 1
1 1 2
2 3 2 1
4 2 2
3 7 3 1
4 8 4 1
(Keep in mind that you might need to order/sort before, depending on your data)
EDIT: As mentioned by the questioner, use df.groupby('id').head(2).reset_index(drop=True) to remo...
Why does Java's Arrays.sort method use two different sorting algorithms for different types?
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rogerdpack
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answered Sep 14 '10 at 8:33
Michael Bor...
Unix command to prepend text to a file
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edited Jun 29 '18 at 6:14
Kyle
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answered May 14 '1...
git reset --hard HEAD leaves untracked files behind
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Eugene Kaurov
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answered Dec 1 '10 at 18:28
knittlknittl
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How to generate a random int in C?
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answered May 4 '09 at 22:18
Łukasz LewŁukasz Lew
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