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Nested defaultdict of defaultdict
...
For an arbitrary number of levels:
def rec_dd():
return defaultdict(rec_dd)
>>> x = rec_dd()
>>> x['a']['b']['c']['d']
defaultdict(<function rec_dd at 0x7f0dcef81500>, {})
>>> print json.dumps(x)
{"a": {"b": {"c": {"d": {}}}}}
...
Using mixins vs components for code reuse in Facebook React
...nding fields.
Source (gist)
define(function () {
'use strict';
var _ = require('underscore');
var ValidationMixin = {
getInitialState: function () {
return {
errors: []
};
},
componentWillMount: function () {
this.assertValidatorsDefined();
},
...
How do I check if there are duplicates in a flat list?
...e set() to remove duplicates if all values are hashable:
>>> your_list = ['one', 'two', 'one']
>>> len(your_list) != len(set(your_list))
True
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Why does SSL handshake give 'Could not generate DH keypair' exception?
...s JCE provider suggestion did.
Here are the steps I took using Java 1.6.0_65-b14-462 on Mac OSC 10.7.5
1) Download these jars:
bcprov-jdk15on-154.jar
bcprov-ext-jdk15on-154.jar
2) move these jars to $JAVA_HOME/lib/ext
3) edit $JAVA_HOME/lib/security/java.security as follows:
security.provid...
Django Passing Custom Form Parameters to Formset
...m functools import partial, wraps
from django.forms.formsets import formset_factory
ServiceFormSet = formset_factory(wraps(ServiceForm)(partial(ServiceForm, affiliate=request.affiliate)), extra=3)
I think this is the cleanest approach, and doesn't affect ServiceForm in any way (i.e. by making it ...
How to find where a method is defined at runtime?
... Fixnum(Perpetrator)#crime>
If you're on Ruby 1.9+, you can use source_location
require 'csv'
p CSV.new('string').method(:flock)
# => #<Method: CSV#flock>
CSV.new('string').method(:flock).source_location
# => ["/path/to/ruby/1.9.2-p290/lib/ruby/1.9.1/forwardable.rb", 180]
Note ...
RegEx for Javascript to allow only alphanumeric
...rs here.
for example: /^([a-zA-Z0-9\u0600-\u06FF\u0660-\u0669\u06F0-\u06F9 _.-]+)$/
this will support persian.
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Difference between Role and GrantedAuthority in Spring Security
...hat says that a role is a GrantedAuthority that starts with the prefix ROLE_. There's nothing more. A role is just a GrantedAuthority - a "permission" - a "right". You see a lot of places in spring security where the role with its ROLE_ prefix is handled specially as e.g. in the RoleVoter, where the...
Why declare unicode by string in python?
...racters in the string (that is, u'\u2665' is now legal). You can use from __future__ import unicode_literals to make it the default.
This only applies to Python 2; in Python 3 the default is Unicode, and you need to specify a b in front (like b'These are bytes', to declare a sequence of bytes).
...
What is the difference between lock and Mutex?
...hine.
bool firstInstance;
Mutex mutex = new Mutex(false, @"Local\DASHBOARD_MAIN_APPLICATION", out firstInstance);
if (!firstInstance)
{
//another copy of this application running
}
else
{
//run main application loop here.
}
// Refer to the mutex down here so garbage collection doesn't chu...