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How can I pass a list as a command-line argument with argparse?
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TL;DR
Use the nargs option or the 'append' setting of the action option (depending on how you want the user interface to behave).
nargs
parser.add_argument('-l','--list', nargs='+', help='<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234...
Multiple commands on same line
I've been trying to find something that will let me run multiple commands on the same line in Vim, akin to using semicolons to separate commands in *nix systems or & in Windows. Is there a way to do this?
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Clojure: reduce vs. apply
I understand the conceptual difference between reduce and apply :
9 Answers
9
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How to properly assert that an exception gets raised in pytest?
How to make pytest print traceback, so I would see where in the whatever function an exception was raised?
11 Answers
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Convert XML to JSON (and back) using Javascript
...nt to parse JSON or JS object into XML then
//default options need not to set
var defaultOptions = {
attributeNamePrefix : "@_",
attrNodeName: "@", //default is false
textNodeName : "#text",
ignoreAttributes : true,
encodeHTMLchar: false,
cdataTagName: "__cdata", //default i...
How to create a fixed-size array of objects
...deallocate()
}
public subscript(index: Int) -> T {
set(value) {
precondition((0...endIndex).contains(index))
memory[index] = value;
}
get {
precondition((0...endIndex).contains(index))
r...
Remove ActiveRecord in Rails 3
...ils/all' or require "active_record/railtie". Instead, for a standard Rails setup without ActiveRecord, it should have only the following requires:
require File.expand_path('../boot', __FILE__)
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
req...
Get encoding of a file in Windows
...re a command line or Windows tool (Windows 7) to get the current encoding of a text file? Sure I can write a little C# app but I wanted to know if there is something already built in?
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Optimal number of threads per core
Let's say I have a 4-core CPU, and I want to run some process in the minimum amount of time. The process is ideally parallelizable, so I can run chunks of it on an infinite number of threads and each thread takes the same amount of time.
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Regex how to match an optional character
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