| [scipy](https://github.com/jupyter/testpath) | Test utilities for code working with files and commands |
| [scipy](https://github.com/jupyter/testpath) | Test utilities for code working with files and commands |
| [SCons](http://www.scons.org/) | SCons is a software construction tool. |
| [SCons](http://www.scons.org/) | SCons is a software construction tool. |
| [singledispatch](https://pypi.python.org/pypi/singledispatch) | A small but fast and easy to use stand-alone template engine written in pure python. |
| [singledispatch](https://pypi.python.org/pypi/singledispatch) | A small but fast and easy to use stand-alone template engine written in pure python. |
| [SIP](http://www.riverbankcomputing.com/software/sip/) | SIP is a tool that makes it very easy to create Python bindings for C and C++ libraries. |
| [six](https://github.com/benjaminp/six) | Python 2 and 3 compatibility library. |
| [six](https://github.com/benjaminp/six) | Python 2 and 3 compatibility library. |
| [spglib-python](https://pypi.python.org/pypi/spglib) | Spglib for Python. Spglib is a library for finding and handling crystal symmetries written in C. |
| [spglib-python](https://pypi.python.org/pypi/spglib) | Spglib for Python. Spglib is a library for finding and handling crystal symmetries written in C. |
| [sympy](http://sympy.org/) | SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries. |
| [sympy](http://sympy.org/) | SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries. |
