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How can I use 'Not Like' operator in MongoDB
...s generally equivalent to /ttt/ in mongodb, so your query would become:
db.test.find({c: {$not: /ttt/}}
EDIT2 (@KyungHoon Kim):
In python, below one works:
'c':{'$not':re.compile('ttt')}
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Mod of negative number is melting my brain
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But is a single % more expensive than a test and jump, especially if it can't easily be predicted?
– Medinoc
Oct 25 '17 at 13:58
add a comme...
Submitting a form by pressing enter without a submit button
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nice one, tested and working fine. But before trying something like this, remember that submitting form via Javascript won't cause some browsers to offer the password saving stuff.
– andyk
Jan 26 ...
Convert generic List/Enumerable to DataTable?
...perDescriptor for the object-type T).
Edit re performance query; here's a test rig with results:
Vanilla 27179
Hyper 6997
I suspect that the bottleneck has shifted from member-access to DataTable performance... I doubt you'll improve much on that...
Code:
using System;
using System.Collections.G...
Regex - Does not contain certain Characters
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Here you go:
^[^<>]*$
This will test for string that has no < and no >
If you want to test for a string that may have < and >, but must also have something other you should use just
[^<>] (or ^.*[^<>].*$)
Where [<>] means a...
Change IPython/Jupyter notebook working directory
...want pylab obviously).
UPDATE FOR JUPYTER NOTEBOOK ~ version 4.1.1
On my test machines and as reported in comments below, the newest jupyter build appears to check the start directory and launch with that as the working directory. This means that the working directory override is not needed.
Thus...
PHP: How to send HTTP response code?
...04);
I recommend the 2nd one. The first does work on all browsers I have tested, but some minor browsers or web crawlers may have a problem with a header line that only contains a colon. The header field name in the 2nd. variant is of course not standardized in any way and could be modified, I jus...
How can I pad an integer with zeros on the left?
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Found this example... Will test...
import java.text.DecimalFormat;
class TestingAndQualityAssuranceDepartment
{
public static void main(String [] args)
{
int x=1;
DecimalFormat df = new DecimalFormat("00");
System.out.p...
How to select rows from a DataFrame based on column values?
...pd.Series
mask = df['A'].values == 'foo'
I'll show more complete time tests at the end, but just take a look at the performance gains we get using the sample data frame. First, we look at the difference in creating the mask
%timeit mask = df['A'].values == 'foo'
%timeit mask = df['A'] == 'foo...
How can I initialise a static Map?
... can create an immutable map using a static initialiser too:
public class Test {
private static final Map<Integer, String> myMap;
static {
Map<Integer, String> aMap = ....;
aMap.put(1, "one");
aMap.put(2, "two");
myMap = Collections.unmodifiableMa...