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Python class inherits object
... two styles of classes depending on the presence or absence of object as a base-class:
"classic" style classes: they don't have object as a base class:
>>> class ClassicSpam: # no base class
... pass
>>> ClassicSpam.__bases__
()
"new" style classes: they have, directly...
程序员之网络安全系列（三）：数据加密之对称加密算法 - 更多技术 - 清泛网...
...pt(bytesToBeEncrypted, passwordBytes);
string result = Convert.ToBase64String(bytesEncrypted);
return result;
}
public static string DecryptText(string input, string password)
{
// Get the bytes of the string
byte[] bytesToBeDecrypted = Convert.FromBase64String(input);...
How to print Boolean flag in NSLog?
...ol value: %d",b);
or
NSLog(@"bool %s", b ? "true" : "false");
On the bases of data type %@ changes as follows
For Strings you use %@
For int you use %i
For float and double you use %f
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How to get a value from a cell of a dataframe?
...]: sub_df.iloc[0]
Out[4]:
A -0.133653
B -0.030854
Name: 2, dtype: float64
In [5]: sub_df.iloc[0]['A']
Out[5]: -0.13365288513107493
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Java: How to get input from System.console()
...tring from the console/keyboard by using Java.
public class ConsoleReadingDemo {
public static void main(String[] args) {
// ====
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Please enter user name : ");
String username = null;
...
How to install a gem or update RubyGems if it fails with a permissions error
...ermissionError)
$ ruby -v
ruby 1.9.3p448 (2013-06-27 revision 41675) [x86_64-darwin12.4.0]
You typically should not need to preface a gem command with sudo. If you feel the need to do so, something is probably misconfigured.
For details about rbenv see the following:
https://github.com/sstephe...
Do I need all three constructors for an Android custom view?
...code in this answer: stackoverflow.com/a/22780035/294884 which seems to be based on your answer - but note that the writer includes use of the Inflator ?
– Fattie
Nov 27 '16 at 1:44
...
Best way to simulate “group by” from bash?
... which is worse than two passes (which is what you get with a trivial hash based implementation). I should have said 'superlinear' instead of quadratic.
– Vinko Vrsalovic
Dec 19 '08 at 13:23
...
Why '&&' and not '&'?
...not computed using bitwise calculations. The result is basically looked up based on the values of the two operands, because the number of possibilities is so small.
Because both values are used for the lookup, this implementation isn't short-circuiting.
...
How to scroll HTML page to given anchor?
...ement is at the top of the view
behavior: 'smooth' // smooth scroll
})
Demonstration example on Codepen
If you want the element to be in the center:
const element = document.querySelector('#element')
const rect = element.getBoundingClientRect() // get rects(width, height, top, etc)
const vie...