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Find current directory and file's directory [duplicate]
...ory a Python file is contained in, write this in that file:
import os
dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relativ...
detach all packages while working in R
...h()[pos]’. This can
be an unquoted name or a character string but _not_ a
character vector. If a number is supplied this is taken as
‘pos’.
So we need to repeatedly call detach() once per element of pkg. There are a couple of other arguments we need to specify to get thi...
What does the “__block” keyword mean?
What exactly does the __block keyword in Objective-C mean? I know it allows you to modify variables within blocks, but I'd like to know...
...
How to convert an image to base64 encoding?
...hould be:
$path = 'myfolder/myimage.png';
$type = pathinfo($path, PATHINFO_EXTENSION);
$data = file_get_contents($path);
$base64 = 'data:image/' . $type . ';base64,' . base64_encode($data);
share
|
...
Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
...a pattern. For example following command will prepend string MyVacation2011_ to all the files with jpg extension.
rename 's/^/MyVacation2011_/g' *.jpg
or
rename <pattern> <replacement> <file-list>
sha...
How do I use vimdiff to resolve a git merge conflict?
...at I want on the terminal, e.g. something along:
--- ./src/dev/arm/RealView_BASE_15560.py 2019-12-27 13:46:41.967021591 +0000
+++ ./src/dev/arm/RealView_LOCAL_15560.py 2019-12-27 13:46:41.979021479 +0000
@@ -994,7 +994,7 @@
...
Truncating all tables in a Postgres database
.../pgSQL can do this. Here's the script:
CREATE OR REPLACE FUNCTION truncate_tables(username IN VARCHAR) RETURNS void AS $$
DECLARE
statements CURSOR FOR
SELECT tablename FROM pg_tables
WHERE tableowner = username AND schemaname = 'public';
BEGIN
FOR stmt IN statements LOOP
...
How can I add new keys to a dictionary?
...gnoring the keys
Create a dictionary from two lists
data = dict(zip(list_with_keys, list_with_values))
New to Python 3.5
Creating a merged dictionary without modifying originals:
This uses a new featrue called dictionary unpacking.
data = {**data1, **data2, **data3}
New to Python 3.9...
How to use Elasticsearch with MongoDB?
...abase through the mongo shell and push some dummy data into it.
mongo YOUR_DATABASE_NAME
db.createCollection(YOUR_COLLECTION_NAME)
for (var i = 1; i <= 25; i++) db.YOUR_COLLECTION_NAME.insert( { x : i } )
Now to Convert the standalone MongoDB into a Replica Set.
First Shutdown the process.
m...
Counting inversions in an array
...nversion.
2a. accumulate the number of inversions to counter variable num_inversions.
2b. remove A[1] from array A and also from its corresponding position in array B
rerun from step 2 until there are no more elements in A.
Here’s an example run of this algorithm. Original array A = (6, 9, 1,...