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Are static class variables possible in Python?
...gt;> X.bar = 0
>>> x = X()
>>> x.bar
0
>>> x.foo
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
AttributeError: X instance has no attribute 'foo'
>>> X.foo = 1
>>> x.foo
1
And class instances can chan...
python: Change the scripts working directory to the script's own directory
...o so that opening relative paths will work:
import os
os.chdir("/home/udi/foo")
However, you asked how to change into whatever directory your Python script is located, even if you don't know what directory that will be when you're writing your script. To do this, you can use the os.path function...
When to wrap quotes around a shell variable?
...rm token splitting and/or wildcard expansion.
Token splitting;
$ words="foo bar baz"
$ for word in $words; do
> echo "$word"
> done
foo
bar
baz
By contrast:
$ for word in "$words"; do echo "$word"; done
foo bar baz
(The loop only runs once, over the single, quoted string.)
...
Checking if a variable is not nil and not zero in ruby
...
"foo"&.nonzero? # => NoMethodError: undefined method 'nonzero?' for "foo":String .... This is not safe to use on arbitrary objects.
– Tom Lord
Jun 6 '17 at 14:38
...
How to find whether or not a variable is empty in Bash
...
if [ ${foo:+1} ]
then
echo "yes"
fi
prints yes if the variable is set. ${foo:+1} will return 1 when the variable is set, otherwise it will return empty string.
...
How to create a jQuery function (a new jQuery method or plugin)?
...ke:
$.fn.myfunction = function () {
console.log(this.length);
};
$('.foo').myfunction();
... will flush to the console the number of elements with the class foo.
Of course, there is a bit more to semantics than that (as well as best practices, and all that jazz), so make sure you read up on...
Check if property has attribute
...ass Library PCL (like me), then here is how you can do it :)
public class Foo
{
public string A {get;set;}
[Special]
public string B {get;set;}
}
var type = typeof(Foo);
var specialProperties = type.GetRuntimeProperties()
.Where(pi => pi.PropertyType == typeof (string)
...
Why are arrays of references illegal?
... Put it this way: you can have a struct of nothing but 16 refs to foo's, and use it in exactly the same way as I'd want to use my array of refs - except that you can't index into the 16 foo references. This is a language wart IMHO.
– greggo
Nov 10 '11 ...
When to use Vanilla JavaScript vs. jQuery?
...tr('id') and .id leans in favor of JS, while choosing between removeClass('foo') versus .className = .className.replace( new Regexp("(?:^|\\s+)"+foo+"(?:\\s+|$)",'g'), '' ) leans in favor of jQuery.
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How to export table as CSV with headings on Postgresql?
...ry from the command line.
psql -U user -d db_name -c "Copy (Select * From foo_table LIMIT 10) To STDOUT With CSV HEADER DELIMITER ',';" > foo_data.csv
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