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Using python's eval() vs. ast.literal_eval()?
I have a situation with some code where eval() came up as a possible solution. Now I have never had
to use eval() before but, I have come across plenty of information about the potential
danger it can cause. That said, I'm very wary about using it.
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How to delay the .keyup() handler until the user stops typing?
...ing a function after the user has stopped typing for a specified amount of time or in events that fire at a high rate, like resize:
function delay(callback, ms) {
var timer = 0;
return function() {
var context = this, args = arguments;
clearTimeout(timer);
timer = setTimeout(func...
Retrieve CPU usage and memory usage of a single process on Linux?
...ebugging).
Note that this gives average CPU usage of the process over the time it has been running.
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convert_tz returns null
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This will happen if you haven't loaded the time zone table into mysql.
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
mysql is the name of the built-in database that holds MySQL-specific configuration data.
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How to make a variadic macro (variable number of arguments)
I want to write a macro in C that accepts any number of parameters, not a specific number
5 Answers
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What is the difference between lower bound and tight bound?
...).
For example, an algorithm taking Omega(n log n) takes at least n log n time, but has no upper limit. An algorithm taking Theta(n log n) is far preferential since it takes at least n log n (Omega n log n) and no more than n log n (Big O n log n).
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Test if remote TCP port is open from a shell script
... on success, 1 on failure.
For a quick interactive check (with a 5 seconds timeout):
nc -z -v -w5 <host> <port>
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JavaScript private methods
To make a JavaScript class with a public method I'd do something like:
30 Answers
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How to wait for 2 seconds?
...ths of a seconds
There is also an alternative method of passing it a DATETIME value. You might think I'm confusing this with WAITFOR TIME, but it also works for WAITFOR DELAY.
Considerations for passing DATETIME:
It must be passed as a variable, so it isn't a nice one-liner anymore.
The delay i...
Why don't C++ compilers define operator== and operator!=?
I am a big fan of letting the compiler do as much work for you as possible. When writing a simple class the compiler can give you the following for 'free':
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