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What is the difference between a pseudo-class and a pseudo-element in CSS?
... selectors in a sequence of simple selectors will be evaluated at the same time. For a complete list of pseudo-class check the CSS3 selector recommendation.
Example
The following example will color all even rows gray (#ccc), all uneven rows which aren't dividable by 5 white and every other row mag...
How to determine if a string is a number with C++?
... If there are utf8 characters in the string, you would get run time error.
– Lion King
Feb 23 '18 at 12:58
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Use numpy array in shared memory for multiprocessing
..., each separately lockable, but with the number of arrays determined at runtime, is that a straightforward extension of what you've done here?
– Andrew
Jan 19 '13 at 4:30
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What is the difference between Non-Repeatable Read and Phantom Read?
...e read: The A row that user A has queried has a different value the second time.
Phantom read: All the rows in the query have the same value before and after, but different rows are being selected (because B has deleted or inserted some). Example: select sum(x) from table; will return a different re...
How to load JAR files dynamically at Runtime?
...be immutable; you shouldn't be able to willy-nilly add classes to it at runtime. I'm actually very surprised that works with the system classloader. Here's how you do it making your own child classloader:
URLClassLoader child = new URLClassLoader(
new URL[] {myJar.toURI().toURL()},
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How to make a flat list out of list of lists?
...[item for sublist in l for item in sublist]
As evidence, you can use the timeit module in the standard library:
$ python -mtimeit -s'l=[[1,2,3],[4,5,6], [7], [8,9]]*99' '[item for sublist in l for item in sublist]'
10000 loops, best of 3: 143 usec per loop
$ python -mtimeit -s'l=[[1,2,3],[4,5,6],...
What's the difference between a proxy server and a reverse proxy server? [closed]
...ecting themselves.
Employees at a large company have been wasting too much time on facebook.com, so management wants access blocked during business hours.
A local elementary school disallows internet access to the playboy.com website.
A government is unable to control the publishing of news, so it c...
Check if an element is present in an array [duplicate]
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@PrithiviRaj It would be linear time, so performance impact would be directly proportional to the size of the array.
– Alister
Jan 23 '18 at 19:58
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Using openssl to get the certificate from a server
...-liner to extract the certificate from a remote server in PEM format, this time using sed:
openssl s_client -connect www.google.com:443 2>/dev/null </dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'
s...
Batch Renaming of Files in a Directory
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Wasted way too much time today trying to figure out why my "rename" command wasn't working - should've came here first! Great Pythonic one-liner!
– Devin
Jan 6 '15 at 18:41
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