/usr/lib/python2.7/dist-packages/mpmath/libmp/backend.py is in python-mpmath 0.19-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | import os
import sys
#----------------------------------------------------------------------------#
# 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 #
# 1) "is" cannot be used to test for special values. Must use "==". #
# 2) There are bugs in GMPY prior to v1.02 so we must use v1.03 or later. #
#----------------------------------------------------------------------------#
# So we can import it from this module
gmpy = None
sage = None
sage_utils = None
try:
xrange
python3 = False
except NameError:
python3 = True
BACKEND = 'python'
from .six import exec_, print_
if not python3:
MPZ = long
xrange = xrange
basestring = basestring
else:
MPZ = int
xrange = range
basestring = str
# Define constants for calculating hash on Python 3.2.
if sys.version >= "3.2":
HASH_MODULUS = sys.hash_info.modulus
if sys.hash_info.width == 32:
HASH_BITS = 31
else:
HASH_BITS = 61
else:
HASH_MODULUS = None
HASH_BITS = None
if 'MPMATH_NOGMPY' not in os.environ:
try:
try:
import gmpy2 as gmpy
except ImportError:
try:
import gmpy
except ImportError:
raise ImportError
if gmpy.version() >= '1.03':
BACKEND = 'gmpy'
MPZ = gmpy.mpz
except:
pass
if 'MPMATH_NOSAGE' not in os.environ:
try:
import sage.all
import sage.libs.mpmath.utils as _sage_utils
sage = sage.all
sage_utils = _sage_utils
BACKEND = 'sage'
MPZ = sage.Integer
except:
pass
if 'MPMATH_STRICT' in os.environ:
STRICT = True
else:
STRICT = False
MPZ_TYPE = type(MPZ(0))
MPZ_ZERO = MPZ(0)
MPZ_ONE = MPZ(1)
MPZ_TWO = MPZ(2)
MPZ_THREE = MPZ(3)
MPZ_FIVE = MPZ(5)
try:
if BACKEND == 'python':
int_types = (int, long)
else:
int_types = (int, long, MPZ_TYPE)
except NameError:
if BACKEND == 'python':
int_types = (int,)
else:
int_types = (int, MPZ_TYPE)
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