Pipenv is a dependency manager for Python projects. If you’re familiar with Node.js’ npm or Ruby’s bundler, it is similar in spirit to those tools. While pip can install Python packages, Pipenv is recommended as it’s a higher-level tool that simplifies dependency management for common use cases.
这说明了 pipvenv 和 virtualenv 的不同，一個是更加高級的 pip ：当我们在使用 pip 时，pip 不能提供运行时环境，pipenv 会帮你把包和 environment 的问题一起解决，及pip + virtualenv。
