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How to get all subsets of a set? (powerset)
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The Python itertools page has exactly a powerset recipe for this:
from itertools import chain, combinations
def powerset(iterable):
"powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
s = list(iterable)
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Recommended way to get hostname in Java
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Strictly speaking - you have no choice but calling either hostname(1) or - on Unix gethostname(2). This is the name of your computer. Any attempt to determine the hostname by an IP address like this
InetAddress.getLocalHost().getHostName()
is bound to fail in some circumstanc...
How to know user has clicked “X” or the “Close” button?
...erClosing to know that the user had decided to close the form
but I guess it is the same for both clicking the X button or clicking the close button.
So how can I differentiate between these two in my code?
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How to replace a string in a SQL Server Table Column
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It's this easy:
update my_table
set path = replace(path, 'oldstring', 'newstring')
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Favicon: .ico or .png / correct tags? [duplicate]
In a HTML5 document, which favicon format do you recommend and why? I want it to be supported by IE7 and all the modern browsers.
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Cancellation token in Task constructor: why?
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Passing a CancellationToken into the Task constructor associates it with the task.
Quoting Stephen Toub's answer from MSDN:
This has two primary benefits:
If the token has cancellation requested prior to the Task starting to execute, the Task won't execute. Rather than transit...
C++11 range based loop: get item by value or reference to const
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If you don't want to change the items as well as want to avoid making copies, then auto const & is the correct choice:
for (auto const &x : vec)
Whoever suggests you to use auto & is wrong. Ignore them.
Here is recap:
Choose auto x when yo...
Sort hash by key, return hash in Ruby
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In Ruby 2.1 it is simple:
h.sort.to_h
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git: updates were rejected because the remote contains work that you do not have locally
I'm working on a team with a few developers using git on BitBucket. We are all working on a dev branch, not pushing to master until a release.
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PHP Redirect with POST data
...some research on this topic, and there are some experts who have said that it is not possible , so I would like to ask for an alternative solution.
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