Work-around that CyPari2 has removed prec_words_to_dec #124
Description
With the newest version 2.2.0 of cypari2 importing snappy results in the below error. It seems that CyPari2 has removed prec_words_to_dec. SnapPy uses that function to estimate how many digits of the decimal representation of a volume are correct. Only when running in Sage does SnapPy use CyPari2 (otherwise it uses CyPari). This only affects people using SnapPy in the not-yet released Sage 10.5.
Traceback (most recent call last):
File "/usr/bin/SnapPy", line 33, in <module>
sys.exit(load_entry_point('snappy==3.1.1', 'console_scripts',
'SnapPy')())
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File
"/usr/bin/SnapPy", line 25, in importlib_load_entry_point return
next(matches).load() ^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/importlib/metadata/__init__.py", line 205,
in load module = import_module(match.group('module'))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/importlib/__init__.py", line 90, in
import_module return _bootstrap._gcd_import(name[level:], package,
level) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
File "<frozen importlib._bootstrap>", line 1310, in
_find_and_load_unlocked File "<frozen importlib._bootstrap>", line 488,
in _call_with_frames_removed File "<frozen importlib._bootstrap>", line
1387, in _gcd_import File "<frozen importlib._bootstrap>", line 1360,
in _find_and_load File "<frozen importlib._bootstrap>", line 1331, in
_find_and_load_unlocked File "<frozen importlib._bootstrap>", line 935,
in _load_unlocked File "<frozen importlib._bootstrap_external>", line
995, in exec_module File "<frozen importlib._bootstrap>", line 488, in
_call_with_frames_removed File
"/usr/lib/python3.12/site-packages/snappy-3.1.1-py3.12-linux-x86_64.egg/snappy/__init__.py",
line 6, in <module> from .SnapPy import (AbelianGroup, File
"cython/numbers/double.pyx", line 1, in init SnapPy File
"/usr/lib/python3.12/site-packages/snappy-3.1.1-py3.12-linux-x86_64.egg/snappy/number.py",
line 6, in <module> from .pari import * File
"/usr/lib/python3.12/site-packages/snappy-3.1.1-py3.12-linux-x86_64.egg/snappy/pari.py",
line 17, in <module> from cypari2.pari_instance import
(prec_words_to_dec, ImportError: cannot import name 'prec_words_to_dec'
from 'cypari2.pari_instance'
(/usr/lib/python3.12/site-packages/cypari2/[pari_instance.cpython-312-x86_64-linux-gnu.so](http://pari_instance.cpython-312-x86_64-linux-gnu.so/)).
Did you mean: 'prec_bits_to_dec'?