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How to list containers in Docker
...izes use the given command:
docker ps -s
The content presented above is from docker.com.
In the new version of Docker, commands are updated, and some management commands are added:
docker container ls
It is used to list all the running containers.
docker container ls -a
And then, if you wa...
Reverting single file in SVN to a particular revision
...p;& svn up, see also What is the correct way to restore a deleted file from SVN?
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Python add item to the tuple
...
From tuple to list to tuple :
a = ('2',)
b = 'b'
l = list(a)
l.append(b)
tuple(l)
Or with a longer list of items to append
a = ('2',)
items = ['o', 'k', 'd', 'o']
l = list(a)
for x in items:
l.append(x)
print tup...
What is memoization and how can I use it in Python?
...
I've found this extremely useful
def memoize(function):
from functools import wraps
memo = {}
@wraps(function)
def wrapper(*args):
if args in memo:
return memo[args]
else:
rv = function(*args)
memo[args] = rv
...
How to “inverse match” with regex?
...
Updated with feedback from Alan Moore
In PCRE and similar variants, you can actually create a regex that matches any line not containing a value:
^(?:(?!Andrea).)*$
This is called a tempered greedy token. The downside is that it doesn't perfo...
How do I detect the Python version at runtime? [duplicate]
...very detailed but machine parsable would be to get the version_info object from platform.sys, instead, and then use its properties to take a predetermined course of action. For example:
import platform;
print(platform.sys.version_info)
Output on my system:
sys.version_info(major=3, minor=6, mic...
How can I detect if a selector returns null?
...
I like to use presence, inspired from Ruby on Rails:
$.fn.presence = function () {
return this.length !== 0 && this;
}
Your example becomes:
alert($('#notAnElement').presence() || "No object found");
I find it superior to the proposed $.fn....
Matching an empty input box using CSS
...ibute was only available in Chrome and Firefox in 2011, and this answer is from 2010. However times have changed and this is no longer the "best" answer, so I have unmarked it as accepted.
– Sjoerd
Apr 12 '17 at 7:47
...
Finding the max/min value in an array of primitives using Java
...lso do max, sum, average,...
The getAsInt method is used to get the value from the OptionalInt
import java.util.Arrays;
public class Test {
public static void main(String[] args){
int[] tab = {12, 1, 21, 8};
int min = Arrays.stream(tab).min().getAsInt();
int max = Arra...
Overriding the java equals() method - not working?
...
In Java, the equals() method that is inherited from Object is:
public boolean equals(Object other);
In other words, the parameter must be of type Object. This is called overriding; your method public boolean equals(Book other) does what is called overloading to the equ...