大约有 36,030 项符合查询结果（耗时：0.0641秒） [XML]
Multiprocessing vs Threading Python [duplicate]
...rpreter Lock, but what other advantages are there, and can threading not do the same thing?
12 Answers
...
Use email address as primary key?
...
String comparison is slower than int comparison. However, this does not matter if you simply retrieve a user from the database using the e-mail address. It does matter if you have complex queries with multiple joins.
If you store information about users in multiple tables, the foreign k...
Calling shell functions with xargs
...
Exporting the function should do it (untested):
export -f echo_var
seq -f "n%04g" 1 100 | xargs -n 1 -P 10 -I {} bash -c 'echo_var "$@"' _ {}
You can use the builtin printf instead of the external seq:
printf "n%04g\n" {1..100} | xargs -n 1 -P 10 -I {...
How can I prevent SQL injection in PHP?
...t malicious SQL.
You basically have two options to achieve this:
Using PDO (for any supported database driver):
$stmt = $pdo->prepare('SELECT * FROM employees WHERE name = :name');
$stmt->execute([ 'name' => $name ]);
foreach ($stmt as $row) {
// Do something with $row
}
Using My...
Python string.replace regular expression [duplicate]
...
str.replace() v2|v3 does not recognize regular expressions.
To perform a substitution using a regular expression, use re.sub() v2|v3.
For example:
import re
line = re.sub(
r"(?i)^.*interfaceOpDataFile.*$",
"interfaceO...
navbar color in Twitter Bootstrap
...
If you havent got time to learn "less" or do it properly, here's a dirty hack...
Add this above where you render the bootstrap nav bar HTML - update the colours as required..
<style type="text/css">
.navbar-inner {
background-color: red;
backgroun...
Make Https call using HttpClient
...e reason, you cannot modify the code in the production setting but able to do some admin on the server, I use this utility to configure TLS 1.2 as default. nartac.com/Products/IISCrypto
– Ronald Ramos
May 12 '16 at 17:21
...
Need for predictable random generator
I'm a web-game developer and I got a problem with random numbers. Let's say that a player has 20% chance to get a critical hit with his sword. That means, 1 out of 5 hits should be critical. The problem is I got very bad real life results — sometimes players get 3 crits in 5 hits, sometimes none i...
Rails: Using greater than/less than with a where statement
...T `users`.* FROM `users` WHERE (`users`.`id` >= 201)
The same can be done for less than with -Float::INFINITY.
I just posted a similar question asking about doing this with dates here on SO.
>= vs >
To avoid people having to dig through and follow the comments conversation here are th...
SSL Error When installing rubygems, Unable to pull data from 'https://rubygems.org/
I am trying to do the Michael Hartl tutorial. When I attempt to install rails 3.2.14 in my gemset, I get the following issue:
...