You’ve tried thumbnail(), resize(), save(quality=20), but you still get an image too big? Maybe it’s because you are generating a PNG file. Change it to JPG and you will get a much smaller file ! It’s because PNG format is a lossless compression file format. Without losing quality you can’t get a considerably small image …
You’ve created a new column and you want set its value as the "id" column. What to do? Add the following line to the generated migration file or you can create new migration file migrations.RunSQL(sql=”update some_table set new_column = id”)
Don’t try to be smart. You must 1. Manually convert query sets to dicts 2. Convert the dicts to JSON Other approaches that convert query sets directly to JSON are not robust.
Problem: 1. A task has a top-level variable, whose value is 1 at first 2. After run once by celery, the value is changed to 2 3. When running task with celery for the second time, you will see the value is still 1 ! That’s because the the worker running for the first …
Keep in mind that celery workers don’t share global states Read More »
There is requirement for a method to get things of a man. Where to put it? man.get_things() or (static) Thing.get_things_by_man() ? From OO’s perspective, the former sounds more natural. I was planning to adopt this approach until I found a problem: it may lead to duplicate db access code because not …
man.get_things() or Thing.get_things_by_man() when Active Records Pattern is used? Read More »
Celery worker’s –autoreload option seems not working for a lot of people, especially those who use OS X. I wrote a python script to start celery worker and monitor the changes in code to reload celery worker if there is any chagne. Check it out here.
According to my test, they are stateful objects. Reusing a single instance will lead to wrong results. Every time you encrypt or decrypt anything, you should create a new cipher, such as cipher = DES3.new(some_key, DES3.MODE_CFB, iv)
if (preg_match("/^[\x{4e00}-\x{9fa5}]+$/u",$str)) { return true; }
codeIgniter默认情况下关闭浏览器不会使session过期。也就是说，如果你没有显式登出而只是关闭浏览器，在一定时间内（codeIgniter默认是２小时）打开浏览器重新访问这个网站,会发现你仍处于登录状态。 为了规避这个风险，应该 //config.php $config[‘sess_expire_on_close’] = TRUE;
preg_replace("/[[:punct:]\s]/",”,$str)