gmpy2 is an optimized, C-coded Python extension module that supports fast multiple-precision arithmetic. gmpy2 is based on the original gmpy module. gmpy2 adds support for correctly rounded multiple-precision real arithmetic (using the MPFR library) and complex arithmetic (using the MPC library). gmpy2 2.1 was extensively refactored. Some of the significant changes are: * Support for thread-safe contexts and context methods * Interoperability with Cython extensions * mpz and mpq operation can release the GIL (controlled by the conntext) * Improved argument processing gmpy2 is available at https://pypi.python.org/pypi/gmpy2/ Documentation is available at https://gmpy2.readthedocs.io/en/latest/ The main source repo is at https://github.com/aleaxit/gmpy, whereas this repo maintains the interface specific to MPIR and the bindings for Visual Studio.