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Why should I declare a virtual destructor for an abstract class in C++?
I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why.
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MySQL - Using COUNT(*) in the WHERE clause
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Ali ErsözAli Ersöz
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Can Java 8 code be compiled to run on Java 7 JVM?
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JesperEJesperE
58.6k1515 gold badges129129 silver badges188188 bronze badges
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What is the meaning of prepended double colon “::”?
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@NoniA. are you asking what the second set of double colons does?
– FCo
Jun 2 '17 at 18:48
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What is the correct way to make a custom .NET Exception serializable?
...SerializationException stating that
// "Type X in Assembly Y is not marked as serializable."
public class SerializableExceptionWithoutCustomProperties : Exception
{
public SerializableExceptionWithoutCustomProperties()
{
}
public SerializableExceptionWith...
Get day of week in SQL Server 2005/2008
... edited Sep 20 '17 at 4:37
Kolappan N
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answered Jul 10 '09 at 17:51
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py2exe - generate single executable file
...xe file with no dependencies; use the --onefile option. It does this by packing all the needed shared libs into the executable, and unpacking them before it runs, just as you describe (EDIT: py2exe also has this feature, see minty's answer)
I use the version of PyInstaller from svn, since the lates...
Peak signal detection in realtime timeseries data
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Robust peak detection algorithm (using z-scores)
I came up with an algorithm that works very well for these types of datasets. It is based on the principle of dispersion: if a new datapoint is a given x number of standard deviations aw...
Send file using POST from a Python script
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From: https://requests.readthedocs.io/en/latest/user/quickstart/#post-a-multipart-encoded-file
Requests makes it very simple to upload Multipart-encoded files:
with open('report.xls', 'rb') as f:
r = requests.post('http://httpbin.org/post', files={'report.xls': f})
That's i...
Why use argparse rather than optparse?
...l arguments
supporting sub-commands
allowing alternative option prefixes like + and /
handling zero-or-more and one-or-more style arguments
producing more informative usage messages
providing a much simpler interface for custom types and actions
More information is also in PEP 389, which is the ve...