I tried to construct a simple sum based on the examples in
test_sums_products.py; here's my code:
from sympy import *
n= Symbol('n', integer=True)
print Rational(1,2)+Rational(1,3)+Rational(1,4)
print sum(Rational(1,n), (n, 2, 4))
The first print statement gives the correct result, 13/12.
The second print statement generates the errors shown below. I'll be
grateful for any suggestions.
Phillip
ValueError Traceback (most recent call
last)
C:\Phillip\Computer\Python\sympy_test.py in <module>()
2 n= Symbol('n', integer=True)
3 print Rational(1,2)+Rational(1,3)+Rational(1,4)
----> 4 print Sum(Rational(1,n), (n, 2, 4))
5
6
C:\Program Files\Python25\lib\site-packages\sympy-0.6.2n2-py2.5.egg
\sympy\core\cache.pyc in wrapper(
*args, **kw_args)
265 pass
266 self.fix_allowed_types()
--> 267 new_args = tuple([template.process(a,func,i) for
(a, template, i) in zip(args, s
elf.arg_templates, range(len(args)))])
268 assert len(args)==len(new_args)
269 new_kw_args = {}
C:\Program Files\Python25\lib\site-packages\sympy-0.6.2n2-py2.5.egg
\sympy\core\cache.pyc in process(
self, obj, func, index)
187 raise ValueError('%s return value must be of type
%r but got %r' % (func_src, se
lf.allowed_types, obj))
188 if isinstance(index, (int,long)):
--> 189 raise ValueError('%s %s-th argument must be of
type %r but got %r' % (func_src,
index, self.allowed_types, obj))
190 if isinstance(index, str):
191 raise ValueError('%s %r keyword argument must be
of type %r but got %r' % (func_
src, index, self.allowed_types, obj))
ValueError: c:\program files\python25\lib\site-packages\sympy-0.6.2n2-
py2.5.egg\sympy\core\numbers.p
y:474:function __new__ 2-th argument must be of type (<type 'int'>,
<type 'long'>, <type 'NoneType'>
) but got n
WARNING: Failure executing file: <sympy_test.py>
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