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Different results with Java's digest versus external utilities
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using System;
using System.IO;
using System.Security.Cryptography;
class Test
{
static void Main()
{
using (var md5 = MD5.Create())
{
string path = "c:/Windows/System32/Calc.exe";
var bytes = md5.ComputeHash(File.ReadAllBytes(path));
Cons...
'await' works, but calling task.Result hangs/deadlocks
I have the following four tests and the last one hangs when I run it. Why does this happen:
5 Answers
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Can you change what a symlink points to after it is created?
... a symlink and thus update the pathname referenced by it:
$ ln -s .bashrc test
$ ls -al test
lrwxrwxrwx 1 pascal pascal 7 2009-09-23 17:12 test -> .bashrc
$ ln -s .profile test
ln: creating symbolic link `test': File exists
$ ln -s -f .profile test
$ ls -al test
lrwxrwxrwx 1 pascal pascal 8 2009...
Test if object implements interface
...tance(object);
}
For example,
java.io.Serializable.class.isInstance("a test string")
evaluates to true.
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Detect if device is iOS
...l answers below needs to take that into account now.
This might be the shortest alternative that also covers iOS 13:
function iOS() {
return [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
].includes(navigator.platform)
// iPad on iOS ...
Detect Android phone via Javascript / jQuery
... lines of the JS solution can be simplified to: var isAndroid = /Android/i.test(navigator.userAgent)
– Dave Koo
Jun 3 '14 at 20:00
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Retrieving the last record in each group - MySQL
...l popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer...
how to check the dtype of a column in python pandas
...ol'). It may be used even for selecting groups of columns based on dtype:
test = pd.DataFrame({'bool' :[False, True], 'int64':[-1,2], 'int32':[-1,2],'float': [-2.5, 3.4],
'compl':np.array([1-1j, 5]),
'dt' :[pd.Timestamp('2013-01-02'), pd.Timestamp('2016-1...
How to find out if a Python object is a string?
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Python 2
Use isinstance(obj, basestring) for an object-to-test obj.
Docs.
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Random “Element is no longer attached to the DOM” StaleElementReferenceException
...'re having problems with StaleElementReferenceExceptions it's because your tests are poorly written. It's a race condition. Consider the following scenario:
WebElement element = driver.findElement(By.id("foo"));
// DOM changes - page is refreshed, or element is removed and re-added
element.click();...