On Wed, Jul 22, 2015 at 1:22 PM, Hong Xu <[email protected]> wrote:
> Hi,
>
> When I tried to run
>
>
> print(sympify('a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z|A|B|C|D|E|F|G|H|I|J|K|L|M|N'))
>
> I got the error:
>
>
> Traceback (most recent call last):
> File "test.py", line 6, in <module>
>
> print(sympify('a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z|A|B|C|D|E|F|G|H|I|J|K|L|M|N'))
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/core/sympify.py", line
> 317, in sympify
> expr = parse_expr(a, local_dict=locals, transformations=transformations,
> evaluate=evaluate)
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/parsing/sympy_parser.py",
> line 820, in parse_expr
> return eval_expr(code, local_dict, global_dict)
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/parsing/sympy_parser.py",
> line 733, in eval_expr
> code, global_dict, local_dict) # take local objects in preference
> File "<string>", line 1, in <module>
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/logic/boolalg.py", line
> 34, in __or__
> return Or(self, other)
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/core/operations.py",
> line 404, in __new__
> _args = frozenset(cls._new_args_filter(args))
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/logic/boolalg.py", line
> 374, in _new_args_filter
> for x in args:
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/core/operations.py",
> line 402, in <genexpr>
> args = (_sympify(arg) for arg in args)
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/core/sympify.py", line
> 350, in _sympify
> return sympify(a, strict=True)
> File
> "/home/user/.local/lib/python3.4/site-packages/sympy/core/sympify.py", line
> 272, in sympify
> raise SympifyError(a)
> sympy.core.sympify.SympifyError: SympifyError: <function N at
> 0x7f3e5c913620>
>
> Is there a hard coded number of variables sympify can handle, or a different
> reason?
The error you see seem to be coming from the last symbol you have,
"N". If I replace it by "K" (say):
>>> print(sympify('a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z|A|B|C|D|E|F|G|H|I|J|K|L|M|K'))
Or(A, B, C, D, E, F, G, H, I, J, K, L, M, a, b, c, d, e, f, g, h, i,
j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z)
sympy has a function, "N":
>>> sympy.N
<function N at 0x7f2437adfb70>
>>> sympy.N.__module__
'sympy.core.evalf'
Best,
Amit.
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