Lazy evaluation in Django middlewares
Attach a lazy evaluated function as a property of request in a middleware.
All posts by Vinta
Setup Jupyter and other Machine Learning tools on macOS
Jupyter Notebook is an interactive environment for running code in the browser. It allows you to create interactive documents that contain live code, rich text elements and visualizations. It's also a widely used tool for Data Scientists to make prototypes or demonstrations.
IPython: the Python REPL interpreter
IPython is a neat alternative of Python's builtin REPL (Read–Eval–Print Loop) interpreter, also a kernel of Jupyter.
Speed up Python and Node.js builds on Travis CI
For Python and Node.js projects, you could totally cache both site-packages and node_modules directories in every Travis CI build.
Django's get_or_create() may raise IntegrityError but subsequent get() raises DoesNotExist
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）。