mpc: Added mpc, which is commonly used in conjunction with gmp and mpfr ( already included ). This is also required by gmpy, which provides Python bindings to these three libraries to allow the use of large precision numbers with high efficiency.
gmpy: Provides Python bindings to gmp, mpfr, and mpc. In short, allows high precision numbers in Python.
sympy: Provides support for symbolic on top of numeric calculations. Provides support for high precision calculation using gmpy with its bindings to gmp, mpfr, and mpc. Part of the SciPy stack.