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What is “thread local storage” in Python, and why do I need it?
...cept for function-local variables (because each function call gets its own set of locals, and threads are always separate function calls.) And even then, only the variables themselves (the names that refer to objects) are local to the function; objects themselves are always global, and anything can ...
Fixed point vs Floating point number
...y 100 to get 1234. When performing math on this number, we'd use this rule set. Adding 5620 or 56.20 to this number would yield 6854 in data or 68.54.
If we want to calculate the decimal part of a fixed-point number, we use the modulo (%) operand.
12.34 (pseudocode):
v1 = 1234 / 100 // get the wh...
Create a Date with a set timezone without using a string representation
...
using .setUTCHours() it would be possible to actually set dates in UTC-time, which would allow you to use UTC-times throughout the system.
You cannot set it using UTC in the constructor though, unless you specify a date-string.
Us...
Unknown column in 'field list' error on MySQL Update query
..._user_profile I'd recommend a nested query:
UPDATE
master_user_profile
SET
master_user_profile.fellow = 'y'
WHERE
master_user_profile.user_id IN (
SELECT tran_user_branch.user_id
FROM tran_user_branch WHERE tran_user_branch.branch_id = 17);
...
Determining the current foreground application from a background task or service
...o the caller. For backwards compatibility, it will still return a small subset of its data: at least the caller's own tasks, and possibly some other tasks such as home that are known to not be sensitive.
– Sam Lu
Jun 29 '14 at 6:11
...
What are the best practices for JavaScript error handling?
...
An immensely interesting set of slides on Enterprise JavaScript Error Handling can be found at http://www.devhands.com/2008/10/javascript-error-handling-and-general-best-practices/
In short it summarizes:
Assume your code will fail
Log errors to t...
Adding a public key to ~/.ssh/authorized_keys does not log me in automatically
...
Setting ssh authorized_keys seem to be simple, but it hides some traps I'm trying to figure.
-- SERVER --
In /etc/ssh/sshd_config, set passwordAuthentication yes to let the server temporarily accept password authentication
--...
PHP编译安装时常见错误解决办法，php编译常见错误 - 更多技术 - 清泛网 - ...
...如下:
yum -y install libXpm-devel
checking for bind_textdomain_codeset in -lc… yes checking for GNU MP support… yes configure: error: Unable to locate gmp.h
代码如下:
yum -y install gmp-devel
checking for utf8_mime2text signature… new checking for U8T_DECOMPOSE… configure: err...
Repair all tables in one go
...`TABLE_SCHEMA`=DATABASE();
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET endloop=1;
OPEN rCursor;
FETCH rCursor INTO tableName;
WHILE endloop = 0 DO
SET @sql = CONCAT("REPAIR TABLE `", tableName, "`");
PREPARE statement FROM @sql;
EXECUTE statement;
FETCH rCursor INTO ...
JavaScript: What are .extend and .prototype used for?
...t back to its own one.
And the usage example:
var Car = Class.Extend({
setColor: function(clr){
color = clr;
}
});
var volvo = Car.Extend({
getColor: function () {
return color;
}
});
Read more about it here at Javascript Inheritance by John Resig 's post.
...