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How to make a Python script run like a service or daemon in Linux
...simple and supported version is Daemonize.
Install it from Python Package Index (PyPI):
$ pip install daemonize
and then use like:
...
import os, sys
from daemonize import Daemonize
...
def main()
# your code here
if __name__ == '__main__':
myname=os.path.basename(sys.argv[0])
...
Case-insensitive search in Rails model
...validates :name, presence: true, uniqueness: {case_sensitive: false}
the index (answer from Case-insensitive unique index in Rails/ActiveRecord?):
execute "CREATE UNIQUE INDEX index_products_on_lower_name ON products USING btree (lower(name));"
I wish there was a more beautiful way to do the fi...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
.../my.cnf）：
[mysqld]
server_id = 100
log_bin = mysql-bin
log_bin_index = mysql-bin.index
sync_binlog = 1
innodb_flush_log_at_trx_commit = 1
innodb_support_xa = 1
注：一定要保证主从服务器各自的server_id唯一，避免冲突。
注：如果没有指定log_bin的话，缺...
Watch multiple $scope attributes
...s array contains the current values of the watch expressions
// with the indexes matching those of the watchExpression array
// i.e.
// newValues[0] -> $scope.foo
// and
// newValues[1] -> $scope.bar
});
...
A beginner's guide to SQL database design [closed]
...ure that every column that you do "where column = val" in any query has an index. Maybe not the most perfect index in the world for the data type, but at least an index.
Set up your foreign keys. Also set up ON DELETE and ON MODIFY rules where relevant, to either cascade or set null, depending on yo...
Detect and exclude outliers in Pandas data frame
...lumn satisfy the
constraint.
Finally, result of this condition is used to index the dataframe.
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How do I iterate over a JSON structure? [duplicate]
...= 0; i < arr.length; i++){
document.write("<br><br>array index: " + i);
var obj = arr[i];
for (var key in obj){
var value = obj[key];
document.write("<br> - " + key + ": " + value);
}
}
note: the for-in method is cool for simple objects. Not very sm...
Error: 10 $digest() iterations reached. Aborting! with dynamic sortby predicate
...abel>
<table>
<tr ng-repeat="item in items track by $index;" ng-init="end($index);">
<td>{{item.number}}</td>
</tr>
</table>
</div>
var app = angular.module('myApp', ["testctrl"]);
var controllers = angular.module("testctrl...
Get specific ArrayList item
...Also, be careful with the arrays indices: in Java, the first element is at index 0. So if you are trying to get the third element, your solution would be mainList.get(2);
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HashSet vs. List performance
... List potentially might calculate offset for the specific element by it's index (because all elements are the same type and potentially occupy same memory size). So List is not necessary enumerates it's elements
– Lu55
Oct 21 '14 at 11:54
...