The standard library does not include build tools that support modern Python packaging standards, as the core de- velopment team has found that it is important to have standard tools that work consistently, even on older versions of Python. The currently recommended build and distribution tools can be installed by invoking the pip module at the command line: python -m pip install setuptools wheel twine Note: For POSIX users (including Mac OS X and Linux users), these instructions assume the use of a virtual environment . For Windows users, these instructions assume that the option to adjust the system PATH environment variable was selected when installing Python. The Python Packaging User Guide includes more details on the currently recommended tools. 7 CHAPTER THREE INSTALLING THE TOOLS