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backend.py

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import fractions

import os

#----------------------------------------------------------------------------#

# Support GMPY for high-speed large integer arithmetic. #

# #

# To allow an external module to handle arithmetic, we need to make sure #

# that all high-precision variables are declared of the correct type. MPZ #

# is the constructor for the high-precision type. It defaults to Python's #

# long type but can be assinged another type, typically gmpy.mpz. #

# #

# MPZ must be used for the mantissa component of an mpf and must be used #

# for internal fixed-point operations. #

# #

# Side-effects: #

# * "is" cannot be used to test for special values. Must use "==". #

#----------------------------------------------------------------------------#

gmpy = None

BACKEND = 'python'

MPZ = int

MPQ = fractions.Fraction

if 'MPMATH_NOGMPY' not in os.environ:

try:

import gmpy2 as gmpy

BACKEND = 'gmpy'

MPQ = gmpy.mpq

except ImportError:

try:

import gmp as gmpy

BACKEND = 'gmp'

except ImportError:

pass

if gmpy:

MPZ = gmpy.mpz

MPZ_ZERO = MPZ(0)

MPZ_ONE = MPZ(1)

MPZ_TWO = MPZ(2)

MPZ_THREE = MPZ(3)

MPZ_FIVE = MPZ(5)

int_types = (int,) if BACKEND == 'python' else (int, MPZ)