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How to insert an item into an array at a specific index (JavaScript)?
...ou want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert).
In this example we will create an array and add an element to it into index 2:
var arr = [];
arr[0] ...
Checking if a string can be converted to float in Python
...
I would just use..
try:
float(element)
except ValueError:
print "Not a float"
..it's simple, and it works
Another option would be a regular expression:
import re
if re.match(r'^-?\d+(?:\.\d+)?$', element) is None:
print "Not float"
...
Set markers for individual points on a line in Matplotlib
...ecify the keyword args linestyle and/or marker in your call to plot.
For example, using a dashed line and blue circle markers:
plt.plot(range(10), linestyle='--', marker='o', color='b')
A shortcut call for the same thing:
plt.plot(range(10), '--bo')
Here is a list of the possible line and ...
Understanding generators in Python
...
Note: this post assumes Python 3.x syntax.†
A generator is simply a function which returns an object on which you can call next, such that for every call it returns some value, until it raises a StopIteration exception, signaling that all values have been...
LINQ: Not Any vs All Don't
...) confusing* when there's an alternative test of equal verbosity and complexity that would return true for the condition we want to act upon. Yet really, I personally find nothing to favour one over the other of the two alternatives you give, and would perhaps lean very slightly toward the former if...
Assigning code to a variable
... to an Action like this:
var ButtonClicked = new Action(() => MessageBox.Show("hi"));
Then call it:
ButtonClicked();
For completeness (in regards to the various comments)...
As Erik stated, you could execute multiple lines of code:
var ButtonClicked = new Action(() =>
{
MessageBox....
Python 3.x rounding behavior
...liar with this module. Any idea how I would get the behavior of Python v 2.x? The examples you show don't seem to do that. Just curious if that would be possible.
– Levon
May 31 '12 at 2:05
...
boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
...o or more fields of a given table The analogous concept in Boost MultiIndex is Composite keys
In relational databases, composite keys depend on two or more fields of a given table. The analogous concept in Boost.MultiIndex is modeled by means of composite_key, as shown in the example:
stru...
Copying PostgreSQL database to another server
...
I would expect that you should be able to copy a remote database with name x to a local database with name y, but @Ferran's solution does not work for this... It looks to me like porneL's solution just leaves the bzip2 files on the s...
Curl GET request with json parameter
..." 'server:5050/a/c/getName{"param0":"pradeep"}'
use option -i instead of x.
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