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Explaining Python's '__enter__' and '__exit__'
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In addition to the above answers to exemplify invocation order, a simple run example
class myclass:
def __init__(self):
print("__init__")
def __enter__(self):
print("__enter__")
def __exit__(self, type, value, traceback):
print("__exit__")
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Optional query string parameters in ASP.NET Web API
...blic int Skip { get; set; }
public int Take { get; set; }
}
Update:
In order to ensure the values are optional make sure to use reference types or nullables (ex. int?) for the models properties.
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How to swap keys and values in a hash
...>[:c, :b]}
h.inverse.inverse
=> {:a=>1, :c=>2, :b=>2} # order might not be preserved
h.inverse.inverse == h
=> true # true-ish because order might change
whereas the built-in invert method is just broken:
h.invert
=> {1=>:a, 2=>:c} # FAIL
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Regular expression for floating point numbers
... and '-.' are invalid
'.1e3' is valid, but '.e3' and 'e3' are invalid
In order to support both '1.' and '.1' we need an OR operator ('|') in order to make sure we exclude '.' from matching.
[+-]? +/- sing is optional since ? means 0 or 1 matches
( since we have 2 sub expressions we need to put t...
Can a Windows batch file determine its own file name?
... gives "c:\tmp\foo.bat". Note the pieces are always assembled in canonical order, so if you get cute and try %~xnpd0, you still get "c:\tmp\foo.bat"
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Difference between a “coroutine” and a “thread”?
... Parallelism is the simultaneous execution of multiple
pieces of work in order to increase speed. —https://github.com/servo/servo/wiki/Design
Short answer: With threads, the operating system switches running threads preemptively according to its scheduler, which is an algorithm in the operatin...
What is a monad?
...ses them pervasively) but can be used in any language which support higher-order functions (that is, functions which can take other functions as arguments).
Arrays in JavaScript support the pattern, so let’s use that as the first example.
The gist of the pattern is we have a type (Array in this ca...
Set every cell in matrix to 0 if that row or column contains a 0
...e pass since a single bit has an effect on bits before and after it in any ordering. IOW Whatever order you traverse the array in, you may later come accross a 0 which means you have to go back and change a previous 1 to a 0.
Update
People seem to think that by restricting N to some fixed value (s...
What's the difference between an inverted index and a plain old index?
...at everyone needs to agree which one is "left" and which one is "right" in order for the words to have meaning. If, as a culture, we decided to flip left and right, then you'd have the same issue figuring out what a "right turn" vs a "left turn" is since the agreed upon meaning had changed. However,...
How many socket connections can a web server handle?
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In short:
You should be able to achieve in the order of millions of simultaneous active TCP connections and by extension HTTP request(s). This tells you the maximum performance you can expect with the right platform with the right configuration.
Today, I was worried wheth...