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What is the best method of handling currency/money?
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If you insist on using integers, you will have to manually convert to and from BigDecimals everywhere, which will probably just become a pain.
As pointed out by mcl, to print the price, use:
number_to_currency(price, :unit => "€")
#=> €1,234.01
...
Logging in Scala
...Scala Logging, but the log messages are sent to an actor which calls SLF4J from a dedicated thread pool. Trades CPU time for (much better) latency. github.com/oncue/journal
– Gary Coady
Jul 24 '15 at 12:03
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Simplest code for array intersection in javascript
...ersection = new Set([...setA].filter(x => setB.has(x)));
return Array.from(intersection);
}
Shorter, but less readable (also without creating the additional intersection Set):
function intersect(a, b) {
var setB = new Set(b);
return [...new Set(a)].filter(x => setB.has(x));
}
Note t...
Getting distance between two points based on latitude/longitude
...ither convert the numbers manually to radians, or use the radians function from the math module:
from math import sin, cos, sqrt, atan2, radians
# approximate radius of earth in km
R = 6373.0
lat1 = radians(52.2296756)
lon1 = radians(21.0122287)
lat2 = radians(52.406374)
lon2 = radians(16.9251681...
Unpacking, extended unpacking and nested extended unpacking
... we get
((a, b), c) = ((1, 2), ('t', 'h', 'i', 's'))
But now it's clear from the structure that 'this' won't be unpacked, but assigned directly to c. So we undo the substitution.
((a, b), c) = ((1, 2), 'this')
Now let's see what happens when we wrap c in a tuple:
(a,b), (c,) = [1,2],'this' ...
std::string to float or double
... @ShaChris Because I want to make sure I use the atof function from the global namespace.
– TimW
Feb 17 '10 at 8:16
1
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What is global::?
...same name in any namespace. If you were to create an instance of the class from within another namespace whereby you defined another meaning for Foo, it would take the most local scoped. See the edit
– chrisw
Feb 22 '13 at 11:19
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How can I check if an ip is in a network in Python?
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I like to use netaddr for that:
from netaddr import CIDR, IP
if IP("192.168.0.1") in CIDR("192.168.0.0/24"):
print "Yay!"
As arno_v pointed out in the comments, new version of netaddr does it like this:
from netaddr import IPNetwork, IPAddress
if IP...
ISO time (ISO 8601) in Python
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Here is what I use to convert to the XSD datetime format:
from datetime import datetime
datetime.now().replace(microsecond=0).isoformat()
# You get your ISO string
I came across this question when looking for the XSD date time format (xs:dateTime). I needed to remove the microseco...
Crop MP3 to first 30 seconds
...de. It is lightning fast.
NOTE: the command was updated based on comment from Oben Sonne
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