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Manually raising (throwing) an exception in Python
...hon!') # Don't! If you catch, likely to hide bugs.
For example:
def demo_bad_catch():
try:
raise ValueError('Represents a hidden bug, do not catch this')
raise Exception('This is the exception you expect to handle')
except Exception as error:
print('Caught this err...
Python argparse ignore unrecognised arguments
...
Replace
args = parser.parse_args()
with
args, unknown = parser.parse_known_args()
For example,
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--foo')
args, unknown = parser.parse_known_args(['--foo', 'BAR', 'spam'])
prin...
When is the @JsonProperty property used and what is it used for?
...ect. Suppose there is an object:
public class Parameter {
public String _name;
public String _value;
}
The serialization of this object is:
{
"_name": "...",
"_value": "..."
}
The name of variable is directly used to serialize data. If you are about to remove system api from system im...
Caching a jquery ajax response in javascript/browser
...
* @type {number}
*/
timeout: 30000,
/**
* @type {{_: number, data: {}}}
**/
data: {},
remove: function (url) {
delete localCache.data[url];
},
exist: function (url) {
return !!localCache.data[url] && ((new Date().getTime() - local...
Simple C example of doing an HTTP POST and consuming the response
...es have \r\n at the end.
A URL has the form of http://host:port/path?query_string
There are two main ways of submitting a request to a website:
GET: The query string is optional but, if specified, must be reasonably short. Because of this the header could just be the GET command and nothing else...
How to sort a list in Scala by two fields?
...ant for longer names (Wild, Wilder, Wilderman).
If you write
rows.sortBy(_.lastName + _.firstName)
with 2 underlines, the method expects two parameters:
<console>:14: error: wrong number of parameters; expected = 1
rows.sortBy (_.lastName + _.firstName)
...
How do I check if a list is empty?
...al consensus seems to be that duck typing wins out (in effect, saying that __nonzero__ is the interface for testing emptiness docs.python.org/reference/datamodel.html#object.__nonzero__)
– andrew cooke
May 31 '12 at 14:50
...
How can I use swift in Terminal?
... Or, you could even take this one step further and add this to your ~/.bash_profile: alias swift="/Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift"
– David Beck
Jun 3 '14 at 21:33
...
Draw text in OpenGL ES
...ble bitmap
Bitmap bitmap = Bitmap.createBitmap(256, 256, Bitmap.Config.ARGB_4444);
// get a canvas to paint over the bitmap
Canvas canvas = new Canvas(bitmap);
bitmap.eraseColor(0);
// get a background image from resources
// note the image format must match the bitmap format
Drawable background = ...
How can I use Timer (formerly NSTimer) in Swift?
...syntax (iOS 10+)
let timer = Timer(timeInterval: 0.4, repeats: true) { _ in print("Done!") }
// Swift >=3 selector syntax
let timer = Timer.scheduledTimer(timeInterval: 0.4, target: self, selector: #selector(self.update), userInfo: nil, repeats: true)
// Swift 2.2 selector syntax
...