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What is the difference between aggregation, composition and dependency? [duplicate]
...e exists composition between class and students."
– TallPaul
Oct 11 '10 at 3:21
19
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Check if string contains only whitespace
...e OP wasn't asking to test for the empty string, but for a string that was all spaces. Your second method isn't bad though. Also, your parens surrounding the conditional aren't needed in python.
– NeilK
Jun 16 '17 at 21:00
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How large should my recv buffer be when calling recv in the socket library
...w how big to make the buffer passed to recv()?
SOCK_STREAM: It doesn't really matter too much. If your protocol is a transactional / interactive one just pick a size that can hold the largest individual message / command you would reasonably expect (3000 is likely fine). If your protocol is tran...
GB English, or US English?
...
Depends where you see most of your customers. I personally prefer using English-GB (e.g. Colour) in my private code, but I go to Color for externally published applications/API/code!
share
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How to test an Internet connection with bash?
...on't get, just check page availability
$? : shell return code
0 : shell "All OK" code
Without wget
#!/bin/bash
echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1
if [ $? -eq 0 ]; then
echo "Online"
else
echo "Offline"
fi
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Can Python test the membership of multiple values in a list?
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This does what you want, and will work in nearly all cases:
>>> all(x in ['b', 'a', 'foo', 'bar'] for x in ['a', 'b'])
True
The expression 'a','b' in ['b', 'a', 'foo', 'bar'] doesn't work as expected because Python interprets it as a tuple:
>>> 'a', 'b...
What is the difference between sql and mysql [closed]
...finitions or descriptions and referring persons to Wiki or elswehere is totally <b>invalidating</b> them, as if they couldn't go to Wiki or elswehere themselves. w/o a guidance! So, I believe this reply is not only out of place but also bad.
– Apostolos
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Twitter bootstrap dropdown goes outside the screen
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This answer does not actually fix the problem if user is using some smaller screen device -- it is going out of the left side in stead of right side (in fact that you just change the pull-left to the pull-right).
– Anonymous
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What is the purpose of setting a key in data.table?
... updated this answer again (Feb 2016) in light of the new on= feature that allows ad-hoc joins as well. See history for earlier (outdated) answers.
What exactly does setkey(DT, a, b) do?
It does two things:
reorders the rows of the data.table DT by the column(s) provided (a, b) by reference, a...
What does the Java assert keyword do, and when should it be used?
... @hoodaticus you mean solely the fact that I can turn on/off all assertions for prod code is the reason? Because I can do complex data validation anyways and then handle it with exceptions. If I have production code, I could turn off the complex (and maybe expensive) assertions, becaus...