> nseries() and series() behave the same way for exp(O(x)) (i.e. graceful
> fail in 0.6.7 and error in 0.6.7-git). The difference is that nseries()
> allows us to easily guess the value of n we should put.
Hm? nseries() works in master for me:
>>> exp(O(x)).nseries(x)
1 + O(x)
>>> exp(O(x)).nseries(x,n=6)
1 + O(x)
>>> exp(O(x)).series(x,n=1)
1 + O(x)
>>> exp(O(x)).series(x,n=2)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "sympy/core/expr.py", line 1259, in series
% (str(n), self))
ValueError: Could not calculate 2 terms for exp(O(x))
I think it's a feature, except that passing no n at all should imho
fail gracefully.
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