Author: Vinta
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Speed up Python and Node.js builds on Travis CI
Category: DevOps, JavaScript, Python
For Python and Node.js projects, you could totally cache both site-packages and node_modules directories in every Travis CI build.
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Django's get_or_create() may raise IntegrityError but subsequent get() raises DoesNotExist
Category: Database, Python, Web Development
get_or_create() 拋出 IntegrityError 但是接著 get() 一次卻會是 DoesNotExist，以上的錯誤常常會發生在 MySQL 的 isolation level 是 REPEATABLE READ 的情況下。MySQL 默認採用 REPEATABLE READ（而 PostgreSQL 預設是 READ COMMITTED）。
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Transaction isolation levels in MySQL
Category: Database
A non-repeatable read occurs, when during the course of a transaction, a row is retrieved twice and the values within the row differ between reads.
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Configure i18n Translations in Django
Category: Python, Web Development
Internationalization and localization for your Django project.
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Python is call-by-assignment
Category: Python
If you pass a mutable object into a method, the method gets a reference to that same object and you can mutate it to your heart's delight, but if you rebind the reference in the method, the outer scope will know nothing about it, and after you're done, the outer reference will still point at the original object. If you pass an immutable object to a method, you still can't rebind the outer reference, and you can't even mutate the object.
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Upload files to Amazon S3 when Travis CI builds pass
Category: DevOps, Python, Web Development
CAUTION! By default, only master branch's builds could trigger deployments in Travis CI.
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Setup a static website on Amazon S3
Category: DevOps, Web Development
Say that you would like to host your static site on Amazon S3 with a custom domain and, of course, HTTPS.
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AWS Lambda Cookbook
Category: DevOps, JavaScript, Web Development
AWS Lambda is an event-driven service that you can upload your code to it and run those code on-demand without having your own servers.
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AWS DynamoDB Notes
Category: Database, DevOps, Web Development
AWS DynamoDB is a fully managed key-value store (also document store) NoSQL database as a service provided by Amazon Web Services. Its pricing model is that you only pay for the throughput (read and write) you use instead of the storage usage and the running hours of database instances.
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argparse: Create a Command-line App with Python
Category: Python
argparse is a Python standard library makes it easy to write a CLI application. You should use this module instead of optparse.