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Using try vs if in python
...a few measurements:
>>> import timeit
>>> timeit.timeit(setup="a=1;b=1", stmt="a/b") # no error checking
0.06379691968322732
>>> timeit.timeit(setup="a=1;b=1", stmt="try:\n a/b\nexcept ZeroDivisionError:\n pass")
0.0829463709378615
>>> timeit.timeit(setup="a=1;b=...
How can I output leading zeros in Ruby?
I'm outputting a set of numbered files from a Ruby script. The numbers come from incrementing a counter, but to make them sort nicely in the directory, I'd like to use leading zeros in the filenames. In other words
...
node and Error: EMFILE, too many open files
...sole.log filename), but only when the current queue is under the limit you set previously.
async.queue get information about availability of the queue through a callback, this callback is called only when data file is read and any action you have to do is achieved. (see fileRead method)
So you ca...
How to use LINQ to select object with minimum or maximum property value
...de those entries with null DateOfBirth field:
Null DateOfBirth values are set to DateTime.MaxValue in order to rule them out of the Min consideration (assuming at least one has a specified DOB).
It can be achieved with a pre-filtering
people.Where(p => p.DateOfBirth.HasValue)
So it's immateria...
What are “signed” cookies in connect/expressjs?
...
Hang on... I am setting the cookies with res.cookie('somethingElseAgainAndAgain', 'signed? Maybe' ); but... I doubt that's signing it! The cookieParser() middleware is there ready to parse signed cookies, but I am definitely not doing the se...
PHP mail function doesn't complete sending of e-mail
...itfalls you may be encountering.
Make sure error reporting is enabled and set to report all errors
Error reporting is essential to rooting out bugs in your code and general errors that PHP encounters. Error reporting needs to be enabled to receive these errors. Placing the following code at the to...
MySQL DISTINCT on a GROUP_CONCAT()
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do { … } while (0) — what is it good for? [duplicate]
I've been seeing that expression for over 10 years now. I've been trying to think what it's good for. Since I see it mostly in #defines, I assume it's good for inner scope variable declaration and for using breaks (instead of gotos.)
...
Sending files using POST with HttpURLConnection
...ing crlf = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
Setup the request:
HttpURLConnection httpUrlConnection = null;
URL url = new URL("http://example.com/server.cgi");
httpUrlConnection = (HttpURLConnection) url.openConnection();
httpUrlConnection.setUseCaches(false);
httpUrlC...
Reasons for using the set.seed function
Many times I have seen the set.seed function in R, before starting the program. I know it's basically used for the random number generation. Is there any specific need to set this?
...