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Use curly braces to initialize a Set in Python
...comprehensive syntax to initialize sets:
>>> a = {x for x in """didn't know about {} and sets """ if x not in 'set' }
>>> a
set(['a', ' ', 'b', 'd', "'", 'i', 'k', 'o', 'n', 'u', 'w', '{', '}'])
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How to add an email attachment from a byte array?
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jQuery / Javascript - How do I convert a pixel value (20px) to a number value (20)
...ut I'd like to be able to use X("20em") for example and get back the true width in pixels.
– Lawrence I. Siden
May 20 '11 at 22:53
2
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Make Heroku run non-master Git branch
...or Heroku debugging is commit something, push it to Heroku, then (if that didn't work) try something else, commit it (with git commit --amend), push that to Heroku (using the -f flag) and repeat until fixed. Once it's fixed, make sure the final --amend is a nice clean commit with a sensible message ...
How to solve the “failed to lazily initialize a collection of role” Hibernate exception
...ands of row, guess what happened ? I think it is misleading because it provides too simple of an answer for a problem that mostly beginners will face and soon enough they will have their whole database loaded in memory if they are not careful (and they won't, because they won't be aware of it) :).
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How can I set the text of a WPF Hyperlink via data binding?
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How to check if there exists a process with a given pid in Python?
Is there a way to check to see if a pid corresponds to a valid process? I'm getting a pid from a different source other than from os.getpid() and I need to check to see if a process with that pid doesn't exist on the machine.
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How to count items in JSON object using command line?
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Require returns an empty object
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How to use mod operator in bash?
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You must put your mathematical expressions inside $(( )).
One-liner:
for i in {1..600}; do wget http://example.com/search/link$(($i % 5)); done;
Multiple lines:
for i in {1..600}; do
wget http://example.com/search/link$(($i % 5))
done
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