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Get program execution time in the shell
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rsync error: failed to set times on “/foo/bar”: Operation not permitted
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How do I filter query objects by date range in Django?
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Method call if not null in C#
...bout this. In the case of an Action or event handler -- which is typically more independent -- this makes some sense. I wouldn't break encapsulation for a regular method, though. This implies creating the method in a separate, static class and I don't think losing encapsulation and degrading readabi...
http HEAD vs GET performance
...d focus on designing the ideal REST interface. A clean REST API is usually more valuable in the long run than a kludgey API that may or may not be faster. I'm not discouraging the use of HEAD, just suggesting that you only use it if it's the "right" design.
If the information you need really is met...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
... to find that Time.at(..) outperforms DateTime.strptime(..) (update: added more benchmarks).
# ~ % ruby -v
# => ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin13.0]
irb(main):038:0> Benchmark.measure do
irb(main):039:1* ["1318996912", "1318496912"].each do |s|
irb(main):040:2* ...
What is a race condition?
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A race condition occurs when two or more threads can access shared data and they try to change it at the same time. Because the thread scheduling algorithm can swap between threads at any time, you don't know the order in which the threads will attempt to acces...
What's a correct and good way to implement __hash__()?
...()
return NotImplemented
Also, the documentation of __hash__ has more information, that may be valuable in some particular circumstances.
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Cloning a MySQL database on the same MySql instance
...and mysql commands accept options for setting connection details (and much more), like:
mysqldump -u <user name> --password=<pwd> <original db> | mysql -u <user name> -p <new db>
Also, if the new database is not existing yet, you have to create it beforehand (e.g. wi...
Flatten an irregular list of lists
...he Iterable ABC added in 2.6.
Python 3
In Python 3, the basestring is no more, but you can use a tuple of str and bytes to get the same effect there.
The yield from operator returns an item from a generator one at a time. This syntax for delegating to a subgenerator was added in 3.3
def flatten(...