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How can I open multiple files using “with open” in Python?
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As of Python 2.7 (or 3.1 respectively) you can write
with open('a', 'w') as a, open('b', 'w') as b:
do_something()
In earlier versions of Python, you can sometimes use
contextlib.nested() to nest context managers. This won't work as expe...
Error type 3 Error: Activity class {} does not exist
... This is the only thing that worked for me with Android Studio 3.1 Canary 7.
– NOTiFY
Jan 11 '18 at 14:00
3
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Does Python have an ordered set?
...signing them None), then one has essentially an ordered set.
As of Python 3.1 there is collections.OrderedDict. The following is an example implementation of an OrderedSet. (Note that only few methods need to be defined or overridden: collections.OrderedDict and collections.MutableSet do the heavy ...
How to recognize swipe in all 4 directions
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Apple Swift version 3.1 - Xcode Version 8.3 (8E162)
The handy way from Alexandre Cassagne's approach
let directions: [UISwipeGestureRecognizerDirection] = [.up, .down, .right, .left]
for direction in directions {
let gesture = UISwipeGestu...
Android studio using > 100% CPU at all times - no background processes appear to be running
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Power save mode is still available in Android Studio 3.1 and has been improved since earlier versions.
– muneikh
Jul 9 '18 at 13:18
|...
Create subdomains on the fly with .htaccess (PHP)
...ory hashing, etc.
For example, the line:
VirtualDocumentRoot /http/users/%3.1/%3.2/%3
would tell Apache to set the document root to /http/users/s/u/subdomain when requested for subdomain.yourdomain.c
Determine what attributes were changed in Rails after_save callback?
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The "selected" answer didn't work for me. I'm using rails 3.1 with CouchRest::Model (based on Active Model). The _changed? methods don't return true for changed attributes in the after_update hook, only in the before_update hook. I was able to get it to work using the (new?) around_...
JSON formatter in C#?
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This worked for me using System.Text.Json in .Net Core 3.1
public string PrettyJson(string unPrettyJson)
{
var options = new JsonSerializerOptions(){
WriteIndented = true
};
var jsonElement = JsonSerializer.Deserialize<JsonElement>(unPrettyJson);
...
How can I call controller/view helper methods from the console in Ruby on Rails?
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If you need to test from the console (tested on Ruby on Rails 3.1 and 4.1):
Call Controller Actions:
app.get '/'
app.response
app.response.headers # => { "Content-Type"=>"text/html", ... }
app.response.body # => "<!DOCTYPE html>\n<html>\n\n<head&g...
Can't find the 'libpq-fe.h header when trying to install pg gem
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:
...