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Logical operators for boolean indexing in Pandas
... < 3 as df.A > (2 &
df.B) < 3, while the desired evaluation order is (df.A > 2) & (df.B <
3).
So, with this in mind, element wise logical AND can be implemented with the bitwise operator &:
df['A'] < 5
0 False
1 True
2 True
3 True
4 False
Name...
Executing JavaScript without a browser?
...oo.js
#!/usr/bin/js
console.log("Hello, world!");
$ ls -lAF /usr/bin/js /etc/alternatives/js /usr/bin/nodejs
lrwxrwxrwx 1 root root 15 Jul 16 04:26 /etc/alternatives/js -> /usr/bin/nodejs*
lrwxrwxrwx 1 root root 20 Jul 16 04:26 /usr/bin/js -> /etc/alternatives/js*
-rwxr-xr-x 1 root...
Debug a java application without starting the JVM with debug arguments
...e jdb MyApp ( and debug interactively , set breakpoints, run, stop, watch, etc etc. )
– OscarRyz
Dec 17 '08 at 22:50
1
...
What exactly do “IB” and “UB” mean?
...to the compiler and need not be defined (or even consistent). Things like order of evaluation of sub-expressions falls in this category. The compiler can perform these in whatever order it likes, and could do it differently in different builds or even in different runs of the same build (unlikely,...
Curious null-coalescing operator custom implicit conversion behaviour
...ression Trees it turns (x ?? y) ?? z into nested lambdas, which ensures in-order evaluation without double evaluation. This is obviously not the approach taken by the C# 4.0 compiler. From what I can tell, section 6.1.4 is approached in a very strict manner in this particular code path and the tempo...
What does “DAMP not DRY” mean when talking about unit tests?
...principle, you will have long and descriptive variable and function names, etc.
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How do I update devDependencies in NPM?
...ove doesn't work):
sudo npm update npm -g
Then relaunch the console (in order for changes to take effect).
Now you can check your new npm --version and if it is up to date execute:
npm update
or (if you prefer):
npm update --save-dev
...
git rebase: “error: cannot stat 'file': Permission denied”
...up the files. As prescribed, close VS before switching branches, merging, etc.
– longda
Mar 20 '13 at 20:11
5
...
If i synchronized two methods on the same class, can they run simultaneously?
...reads are shut out of all synchronized instance methods on that object.
In order for the two methods to run concurrently they would have to use different locks, like this:
class A {
private final Object lockA = new Object();
private final Object lockB = new Object();
public void methodA...
Rest with Express.js nested router
...ire('./products'));
router.use('/categories', require('./categories'));
// etc.
module.exports = router;
./routes/api/products.js:
var router = require('express').Router();
// api/products
router.get('/', function(req, res) {
res.json({ products: [] });
});
// api/products/:id
router.get('/:...