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For MP work in Python, gmpy2 - https://pypi.org/project/gmpy2/ comes with a much better selection of MP functions, backed by MPFR, MPC.

Also, the buit-in Decimal class is horribly slow by comparison to gmpy2.

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Purpose of the Decimal module is not really arbitrary precision computation but rather exact computation on decimal numbers wherever it matters (financial arithmetic, etc.). This module should never be used for scientific purposes.

Also (shameless self-promotion) python-flint! http://fredrikj.net/python-flint/

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