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“Inner exception” (with traceback) in Python?
... is thrown I typically want to wrap it in another exception that adds more information, while still showing the full stack trace. It's quite easy in C#, but how do I do it in Python?
...
Redirect STDERR / STDOUT of a process AFTER it's been started, using command line?
...> /var/log/lastlog
$ gdb -p 5636
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitt...
How can I add reflection to a C++ application?
...not managed C++, which has reflection. I realise C++ supplies some limited information using RTTI. Which additional libraries (or other techniques) could supply this information?
...
What is the copy-and-swap idiom?
...d ready to be used. This is what gives us a strong exception guarantee for free: we won't even enter the function if construction of the copy fails, and it's therefore not possible to alter the state of *this. (What we did manually before for a strong exception guarantee, the compiler is doing for u...
Twitter Bootstrap 3.0 how do I “badge badge-important” now
...el-success">Success</span>
<span class="label label-pill label-info">Info</span>
<span class="label label-pill label-warning">Warning</span>
<span class="label label-pill label-danger">Danger</span>
11/04/2014: Here's an update on why cross-pollinat...
Is there a rule-of-thumb for how to divide a dataset into training and validation sets?
...set should be
inversely proportional to the square root of the number of free
adjustable parameters.
In their conclusion they specify a formula:
Validation set (v) to training set (t) size ratio, v/t, scales like
ln(N/h-max), where N is the number of families of recognizers and
h-max i...
Are Exceptions in C++ really slow
...ypical if (error) strategy:
the Zero-Cost model, as the name implies, is free when no exceptions occur
it costs around 10x/20x an if when an exception does occur
The cost, however, is not trivial to measure:
The side-table is generally cold, and thus fetching it from memory takes a long time
D...
Which iomanip manipulators are 'sticky'?
...Sticky
All the other manipulators return a stream object. Thus any state information they change must be recorded in the stream object and is thus permanent (until another manipulator changes the state). Thus the following manipulators must be Sticky manipulators.
[no]boolalpha
[no]showbase
[no]s...
App Inventor 2 FTP 客户端拓展：FTP协议连接、上传、下载、创建、修改目录...
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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
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