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List comprehension: Returning two (or more) items for each item
Is it possible to return 2 (or more) items for each item in a list comprehension?
6 Answers
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Why can't my program compile under Windows 7 in French? [closed]
I'm running Windows 7 French and I'm trying to compile this really basic program, but Visual Studio is being stubborn and refuses to comply. I also tried compiling it with both GCC 4.7 and Clang trunk on Coliru and I get more or less the same errors (output is below the code), though I think Colir...
MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES)
...ands.
The recommended solution is to drop this anonymous user (this is usually a good thing to do anyways).
Below edits are mostly irrelevant to the main question. These are only meant to answer some questions raised in other comments within this thread.
Edit 1
Authenticating as 'bill'@'%' thr...
C++简练易用的线程池(threadpool)及上下文隔离的无锁线程池(isolated_threa...
... bind： .commit(std::bind(&Dog::sayHello, &dog));
// 一种是用 mem_fn： .commit(std::mem_fn(&Dog::sayHello), this)
template<class F, class... Args>
auto commit(F&& f, Args&&... args) ->future<decltype(f(args...))>
{
if (!_run)
throw runtime_error("commit on ThreadPool is stopped.")...
What's the difference between a proc and a lambda in Ruby?
...ept the resulting Proc objects check the number of parameters passed when called.
An example:
p = Proc.new {|a, b| puts a**2+b**2 } # =&gt; #&lt;Proc:0x3c7d28@(irb):1&gt;
p.call 1, 2 # =&gt; 5
p.call 1 # =&gt; NoMethodError: undefined method `**' for nil:NilClass
p.call 1, 2, 3 # =&gt; 5
l = lamb...
Copying PostgreSQL database to another server
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You don't need to create an intermediate file. You can do
pg_dump -C -h localhost -U localuser dbname | psql -h remotehost -U remoteuser dbname
or
pg_dump -C -h remotehost -U remoteuser dbname | psql -h localhost -U localuser dbname
using psql or pg_dump to c...
AngularJS HTTP post to PHP and undefined
...send that as data. Make sure that this query string is URL encoded. If manually built (as opposed to using something like jQuery.serialize()), Javascript's encodeURIComponent() should do the trick for you.
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How do I reset a sequence in Oracle?
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alter sequence serial restart start with 1;
This feature was officially added in 18c but is unofficially available since 12.1.
It is arguably safe to use this undocumented feature in 12.1. Even though the syntax is not included in the official documentation, it is generated by the Oracle pa...
How do I specify new lines on Python, when writing on files?
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It depends on how correct you want to be. \n will usually do the job. If you really want to get it right, you look up the newline character in the os package. (It's actually called linesep.)
Note: when writing to files using the Python API, do not use the os.linesep. Just use ...
How do I determine the target architecture of static library (.a) on Mac OS X?
...cutable ppc
Example with archive:
logan:/Users/logan% file /usr/lib/libMallocDebug.a
/usr/lib/libMallocDebug.a: Mach-O universal binary with 2 architectures
/usr/lib/libMallocDebug.a (for architecture i386): current ar archive random library
/usr/lib/libMallocDebug.a (for architecture ppc): ...