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namedtuple and default values for optional keyword arguments
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Python 3.7
Use the defaults parameter.
>>> from collections import namedtuple
>>> fields = ('val', 'left', 'right')
>>> Node = namedtuple('Node', fields, defaults=(None,) * len(fields))
>>> Node()
Node(val=None, left=None, right=None)
Or b...
Execute bash script from URL
...second worked somewhat but has its limitations. It is executing the script from the URL in a subshell. I have some functions defined in the script that I would like to use in the parent. Is there anyway to achieve that? Or am I out of luck and the only solution is to copy that script in a temporary ...
Using R to download zipped data file, extract, and import data
...to fetch the file into the temp. file
Use unz() to extract the target file from temp. file
Remove the temp file via unlink()
which in code (thanks for basic example, but this is simpler) looks like
temp <- tempfile()
download.file("http://www.newcl.org/data/zipfiles/a1.zip",temp)
data <- re...
How to remove the lines which appear on file B from another file A?
...s that match the entire line
-v: print non-matching
-f file: take patterns from the given file
This method is slower on pre-sorted files than other methods, since it is more general. If speed matters as well, see: Fast way of finding lines in one file that are not in another?
Here's a quick bash ...
How do I decode HTML entities in Swift?
I am pulling a JSON file from a site and one of the strings received is:
23 Answers
23...
How to remove all event handlers from an event
...ion on the MSDN forums. The sample code below will remove all Click events from button1.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
button1.Click += button1_Click;
button1.Click += button1_Click2;
button2.Click += button2_Clic...
Client on node: Uncaught ReferenceError: require is not defined
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I am coming from an electron environment, where I need IPC communication between a renderer process and the main process. The renderer process sits in an HTML file between script tags and generates the same error.
The line
const {ipcRe...
How to show the “Are you sure you want to navigate away from this page?” when changes committed?
...overflow, if you started to make changes then you attempt to navigate away from the page, a javascript confirm button shows up and asks: "Are you sure you want to navigate away from this page?" blee blah bloo...
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Convert from java.util.date to JodaTime
...rry out subtractions between dates. Is there a good concise way to convert from Date to JodaTime ?
2 Answers
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Recommended way to get hostname in Java
...is possible for many reasons. Generally, software should get the hostname from the user in a config file, that way, it is always the correct hostname. You could use InetAddress.getLocalhost().getHostName() as a default if the user does not provide a value.
– Greg
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