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When and why should I use a namedtuple instead of a dictionary? [duplicate]
... to create a bunch of instances of a class like:
class Container:
def __init__(self, name, date, foo, bar):
self.name = name
self.date = date
self.foo = foo
self.bar = bar
mycontainer = Container(name, date, foo, bar)
and not change the attributes after you se...
How can I custom-format the Autocomplete plug-in results?
...cluded in v1.8rc3 of jQuery UI, the popup of suggestions is created in the _renderMenu function of the autocomplete widget. This function is defined like this:
_renderMenu: function( ul, items ) {
var self = this;
$.each( items, function( index, item ) {
self._renderItem( ul, item...
ElasticSearch: Unassigned Shards, how to fix?
...enable shard allocation.
# v0.90.x and earlier
curl -XPUT 'localhost:9200/_settings' -d '{
"index.routing.allocation.disable_allocation": false
}'
# v1.0+
curl -XPUT 'localhost:9200/_cluster/settings' -d '{
"transient" : {
"cluster.routing.allocation.enable" : "all"
}
}'
Elas...
do N times (declarative syntax)
...s 2017, you may use ES6:
[1,2,3].forEach(i => Array(i).fill(i).forEach(_ => {
something()
}))
or in good old ES5:
[1,2,3].forEach(function(i) {
Array(i).fill(i).forEach(function() {
something()
})
}))
In both cases, the outpout will be
The outpout will be
something
somethin...
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...
MySQL Removing Some Foreign keys
...You can use this to find foreign key constraints: SELECT * FROM information_schema.table_constraints WHERE constraint_schema = '<your db name>' AND constraint_type = 'FOREIGN KEY'
– Gayan Dasanayake
Aug 26 '17 at 2:48
...
REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...-bb04-c4fba00686a7
ONBOOT=yes #no 改成yes 启动自动激活
NM_CONTROLLED=yes
BOOTPROTO=static #原来的DHCP 改成static
IPADDR=192.168.8.106 #根据自己的情况修改
NETMASK=255.255.240.0
GATEWAY=192.168.0.254 #我要连接外网所以加了网关和DNS
DNS...
How to make the python interpreter correctly handle non-ASCII characters in string operations?
...e(u"Â ", u"") But in Python 3, just use quotes. In Python 2, you can from __future__ import unicode_literals to obtain the Python 3 behavior, but be aware this affects the entire current module.
s.replace(u"Â ", u"") will also fail if s is not a unicode string.
string.replace returns a new string ...
Automatically import modules when entering the python or ipython interpreter
...roduction scripts.
For Ipython, see this tutorial on how to make a ipython_config file
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Temporarily disable auto_now / auto_now_add
...s:
# my model
class FooBar(models.Model):
title = models.CharField(max_length=255)
updated_at = models.DateTimeField(auto_now=True, auto_now_add=True)
# my tests
foo = FooBar.objects.get(pk=1)
# force a timestamp
lastweek = datetime.datetime.now() - datetime.timedelta(days=7)
FooBar.obj...