from pandas_datareader import data
# Only get the adjusted close.
aapl = data.DataReader("AAPL",
start='2015-1-1',
end='2015-12-31',
data_source='yahoo')['Adj Close']
>>> aapl.plot(title='AAPL Adj. C...
chrome.runtime.getManifest() returns the extension's manifest in a form of a parsed object.
This method works both on content scripts and all extension pages, it requires no permissions,
Example, obtaining the extension's version string:
var version = chrome.runtime.getManifest().version;
To cancel a call to requestAnimationFrame, you need the id it returned from when it was last called. This is the parameter you use for cancelAnimationFrame. The following example starts some hypothetical animation then pauses it after one second.
// stores the id returned from each call to reques...
C++11
Deriving a class may be forbidden with final specifier. Let's declare a final class:
class A final {
};
Now any attempt to subclass it will cause a compilation error:
// Compilation error: cannot derive from final class:
class B : public A {
};
Final class may appear anywhere in cl...
When you use or, it will either return the first value in the expression if it's true, else it will blindly return the second value. I.e. or is equivalent to:
def or_(a, b):
if a:
return a
else:
return b
For and, it will return its first value if it's false, else it r...
Recursion occurs when a function call causes that same function to be called again before the original function call terminates. For example, consider the well-known mathematical expression x! (i.e. the factorial operation). The factorial operation is defined for all nonnegative integers as follows:...
1) Use ng-repeat sparingly
Using ng-repeat in views generally results in poor performance, particularly when there are nested ng-repeat's.
This is super slow!
<div ng-repeat="user in userCollection">
<div ng-repeat="details in user">
{{details}}
</div...
$scope.$emit
Using $scope.$emit will fire an event name upwards through the scope hierarchy and notify to the $scope.The event life cycle starts at the scope on which $emit was called.
Working wireframe :
$scope.$broadcast
Using $scope.$broadcast will fire an event down the $scope. We can list...
First define the service (in this case it uses the factory pattern):
.factory('dataService', function() {
var dataObject = {};
var service = {
// define the getter method
get data() {
return dataObject;
},
// define the setter method
...
We can use Predefined Constants for Date format in date() instead of the conventional date format strings since PHP 5.1.0.
Predefined Date Format Constants Available
DATE_ATOM - Atom (2016-07-22T14:50:01+00:00)
DATE_COOKIE - HTTP Cookies (Friday, 22-Jul-16 14:50:01 UTC)
DATE_RSS - RSS (Fri, 22...
Technically, autoloading works by executing a callback when a PHP class is required but not found. Such callbacks usually attempt to load these classes.
Generally, autoloading can be understood as the attempt to load PHP files (especially PHP class files, where a PHP source file is dedicated for a ...
An anonymous function is just a function that doesn't have a name.
// Anonymous function
function() {
return "Hello World!";
};
In PHP, an anonymous function is treated like an expression and for this reason, it should be ended with a semicolon ;.
An anonymous function should b...
Program units often make use of literal constants. These cover the obvious cases like
print *, "Hello", 1, 1.0
Except in one case, each literal constant is a scalar which has type, type parameters and value given by the syntax.
Integer literal constants are of the form
1
-1
-1_1 ...
Basics
A tuple is an ordered, finite list of elements. Tuples are commonly used in programming as a means to work with one single entity collectively instead of individually working with each of the tuple's elements, and to represent individual rows (ie. "records") in a relational databa...
Let there be Activity B that can be opened, and can further start more Activities. But, user should not encounter it when navigating back in task activities.
The simplest solution is to set the attribute noHistory to true for that <activity> tag in AndroidManifest.xml:
<activity
a...
Imagine you have the following HTML:
<div>
<label>Name:</label>
John Smith
</div>
And you need to locate the text "John Smith" after the label element.
In this case, you can locate the label element by text and then use .next_sibling property:
from ...
When running from the CLI, PHP exhibits some different behaviours than when run from a web server. These differences should be kept in mind, especially in the case where the same script might be run from both environments.
No directory change When running a script from a web server, the current w...
we can use filters to sanitize our variable according to our need.
Example
$string = "<p>Example</p>";
$newstring = filter_var($string, FILTER_SANITIZE_STRING);
var_dump($newstring); // string(7) "Example"
above will remove the html tags from $string variable.
...
