Weave provides tools for including C/C++ code within Python code. Inlining C/C++ code within Python generally results in speedups of 1.5x to 30x over algorithms written in pure Python. Weave is the stand-alone version of the deprecated Scipy submodule scipy.weave. It is Python 2.x only, and is provided for users that need new versions of Scipy (from which the weave submodule may be removed) but have existing code that still depends on scipy.weave. For new code, users are recommended to use Cython.