python - Why is pyDatalog not terminating? -

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i'm taking @ pydatalog , created quick conversion program loosely based on blog entry:

convert_length.py:

from pydatalog import pydatalog  pydatalog.create_terms(','.join((     'scale',     'convert',     'from',     'to',     'intermediate',     'value',     'x',     'y')))  scale['meter', 'aln'] = 1.684132 scale['meter', 'angstrom'] = 1e+10 scale['meter', 'centimeter'] = 100 scale['meter', 'millimeter'] = 1000 scale['meter', 'inch'] = 39.370079  scale['light year', 'meter'] = 9.461e+15 scale['astronomical unit', 'meter'] = 1.496e+11  scale['foot', 'inch'] = 12 scale['yard', 'foot'] = 3 scale['mile', 'yard'] = 1760   scale['meter', 'm'] = 1 scale['centimeter', 'cm'] = 1 scale['millimeter', 'mm'] = 1 scale['light year', 'ly'] = 1 scale['astronomical unit', 'au'] = 1  scale[from, to] = 1/scale[to, from] scale[from, to] = scale[from, intermediate] * scale[intermediate, to]  convert[value, from, to] = value * scale[from, to]

things start in shell last print statement hangs:

python 3.5.2 (default, jul  5 2016, 12:43:10)  type "copyright", "credits" or "license" more information.  ipython 5.1.0 -- enhanced interactive python. ?         -> introduction , overview of ipython's features. %quickref -> quick reference.      -> python's own system. object?   -> details 'object', use 'object??' details.  in [1]: run convert_length.py  in [2]: print(x.in_(range(2))) x - 0 1  in [3]: print((y == convert[1, 'cm', 'inch'])) y                   ------------------- 0.39370078999999997  in [4]: print(x.in_(range(2)) & (y == convert[1, 'cm', 'inch']))

... , haven't substituted x in 1 see couple of values yet!

(scratch) ~/wk/pydatalog $ pip freeze | grep -i pydatalog pydatalog==0.17.1

am doing wrong?





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