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How to make a flat list out of list of lists?
...of the sum (if not given, 0 is used instead and this case will give you an error).
Because you are summing nested lists, you actually get [1,3]+[2,4] as a result of sum([[1,3],[2,4]],[]), which is equal to [1,3,2,4].
Note that only works on lists of lists. For lists of lists of lists, you'll need ...
Hidden features of Eclipse [closed]
...
Ctrl+. (period) take you to the next error (red/yellow squiggly)....With these two, you are in a error fixing mode. :D
– st0le
Dec 1 '11 at 14:02
...
由12306.cn谈谈网站性能技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，只要带宽、I/O够强，服务器计算能力够，并支持的并发连接数顶得住10万TCP链接的建立 的话，那没有问题。但在数据一致性面前，这10万就完完全全成了一个可望不可及的理论值了。
我说那么多，我只是想从业务上告诉大家...
Pairs from single list
...
IndexError: pop from empty list
– HQuser
May 18 '19 at 11:48
...
How do I modify fields inside the new PostgreSQL JSON datatype?
...r the JSON object when the key is not used. If it's used, it will raise an error:
SELECT jsonb_insert('{"a":[null,{"b":[1]}]}', '{a,1,c}', jsonb '[2]')
-- will yield jsonb '{"a":[null,{"b":[1],"c":[2]}]}', but
SELECT jsonb_insert('{"a":[null,{"b":[1]}]}', '{a,1,b}', jsonb '[2]')
-- will raise SQLSTA...
Save Screen (program) output to a file
..., a screen run overnight with a config file created and deleted on the fly errored out on a screen -r with "Unable to open "/tmp/log.conf". Also, the screen went from [detached] state to non-existent. What could have been the problem?
– Ram RS
Oct 13 '16 at 14:...
How do you use vim's quickfix feature?
...p (at least for me). I just installed this vim script for JavaScriptLint error checking, which shows errors in vim's quickfix window once I save a buffer.
...
What's the fastest way to loop through an array in JavaScript?
...e better performance, writing code that is less legible and more prone to errors than a simple straightforward for loop. Therefore, I recommend:
If your app iterates over a lot of items or your loop code is inside a function that is used often, a straightforward for loop is the answer:
for (var ...
Is there a bash command which counts files?
...gt;/dev/null redirects stderr so that if there are 0 log files, ignore the error message. (Note that shopt -s nullglob would cause ls to list the entire working directory instead.)
wc -l consumes the directory listing as it's being generated, so the output of ls is never in memory at any point in ti...
New features in java 7
...tiple exception catching
this:
} catch (FirstException ex) {
logger.error(ex);
throw ex;
} catch (SecondException ex) {
logger.error(ex);
throw ex;
}
becomes:
} catch (FirstException | SecondException ex) {
logger.error(ex);
throw ex;
}
SafeVarargs
this:
@Suppre...