Comment #1 on issue 2497 by [email protected]: Make Tuple do sequence
repetition
http://code.google.com/p/sympy/issues/detail?id=2497
Is this because it derives from Basic? I ran into Tuple trouble the other
day when trying to do substitutions because I couldn't replace it with
something else during subs because it doesn't have Expr methods:
>>> eq
1 + Sum(x, (x, 1, 2))
>>> eq.subs(Tuple(x, 1, 2), Tuple(x, 1, 3))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\basic.py", line 735, in subs
return self._subs_old_new(old, new)
File "sympy\core\cache.py", line 103, in wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "sympy\core\basic.py", line 744, in _subs_old_new
return self._eval_subs(old, new)
File "sympy\core\add.py", line 350, in _eval_subs
coeff_old, terms_old = old.as_coeff_add()
AttributeError: 'Tuple' object has no attribute 'as_coeff_add'
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