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pandas three-way joining multiple dataframes on columns
...g) names of people, while all the other columns in each dataframe are attributes of that person.
10 Answers
...
How to get all subsets of a set? (powerset)
...e has exactly a powerset recipe for this:
from itertools import chain, combinations
def powerset(iterable):
"powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
s = list(iterable)
return chain.from_iterable(combinations(s, r) for r in range(len(s)+1))
Output:
>&...
Hiding the scroll bar on an HTML page
...
Set overflow: hidden; on the body tag like this:
<style type="text/css">
body {
overflow: hidden;
}
</style>
The code above hides both the horizontal and vertical scrollbar.
If you want to hide only the vertical scrollbar, use ov...
Better way to sum a property value in an array
...erCollection extends Array {
sum(key) {
return this.reduce((a, b) => a + (b[key] || 0), 0);
}
}
const traveler = new TravellerCollection(...[
{ description: 'Senior', Amount: 50},
{ description: 'Senior', Amount: 50},
{ description: 'Adult', Amount: 75},
{ desc...
Chrome sendrequest error: TypeError: Converting circular structure to JSON
...
It means that the object you pass in the request (I guess it is pagedoc) has a circular reference, something like:
var a = {};
a.b = a;
JSON.stringify cannot convert structures like this.
N.B.: This would be the case with DOM nodes, which h...
How to comment lines in rails html.erb files? [duplicate]
Am a newbie to rails ,
please let me know the way to comment out a single line and also to comment out
a block of lines in *.html.erb files.
...
Add a prefix string to beginning of each line
...efix/' file
# If you want to create a new file
sed -e 's/^/prefix/' file > file.new
If prefix contains /, you can use any other character not in prefix, or
escape the /, so the sed command becomes
's#^#/opt/workdir#'
# or
's/^/\/opt\/workdir/'
...
Extract value of attribute node via XPath
...
//Parent[@id='1']/Children/child/@name
Your original child[@name] means an element child which has an attribute name. You want child/@name.
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...
Java: Class.this
...s refers to this of the enclosing class.
This example should explain it:
public class LocalScreen {
public void method() {
new Runnable() {
public void run() {
// Prints "An anonymous Runnable"
System.out.println(this.toString());...
How to calculate number of days between two dates
...tps://date-fns.org/
From Moment docs:
var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days') // =1
or to include the start:
a.diff(b, 'days')+1 // =2
Beats messing with timestamps and time zones manually.
Depending on your specific use case, you can either
Use ...