It is common that the different projects you are working on depend on different versions of Python. That is why pyenv becomes very handy for Python developers, as it lets you switch between different Python versions easily. With pyenv-virtualenv it can also be used together with virtualenv to create isolated development environments for different projects with different dependencies.

Matplotlib by default does not support displaying Unicode characters such as Chinese, Japanese and Korean characters. This post introduces two different methods to allow these characters to be shown in the graphs.