Updates:
Status: Accepted
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Comment #6 on issue 2386 by asmeurer: gosper(...) is missing tests and
docstring
http://code.google.com/p/sympy/issues/detail?id=2386
See issue 1525 comment 24. This introduced a problem:
In [1]: factorial(x).series(x, 0, 3)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/Users/aaronmeurer/Documents/python/sympy/sympy/<ipython console> in
<module>()
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/expr.py in
series(self, x, x0, n, dir)
1342
1343 if n != None: # nseries handling
-> 1344 s1 = self._eval_nseries(x, n=n, logx=None)
1345 o = s1.getO() or S.Zero
1346 if o:
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/function.pyc in
_eval_nseries(self, x, n, logx)
361 g = None
362 for i in xrange(n+2):
--> 363 g = self.taylor_term(i, arg, g)
364 g = g.nseries(x, n=n, logx=logx)
365 l.append(g)
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/function.pyc in
taylor_term(cls, n, x, *previous_terms)
520 """
521 x = sympify(x)
--> 522 return cls(x).diff(x, n).subs(x, 0) * x**n / C.Factorial(n)
523
524
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/basic.pyc in
subs(self, *args)
802 elif len(args) == 2:
803 old, new = args
--> 804 return self._subs_old_new(old, new)
805 else:
806 raise TypeError("subs accepts either 1 or 2 arguments")
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/cache.py in
wrapper(*args, **kw_args)
101 except KeyError:
102 pass
--> 103 func_cache_it_cache[k] = r = func(*args, **kw_args)
104 return r
105 return wrapper
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/basic.pyc in
_subs_old_new(self, old, new)
811 old = sympify(old)
812 new = sympify(new)
--> 813 return self._eval_subs(old, new)
814
815 def _eval_subs(self, old, new):
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/function.pyc in
_eval_subs(self, old, new)
700 if self==old:
701 return new
--> 702 return Derivative(*map(lambda x: x._eval_subs(old, new),
self.args))
703
704 def matches(self, expr, repl_dict={}, evaluate=False):
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/core/function.pyc in
__new__(cls, expr, *symbols, **assumptions)
618
619 if i == iwas: # didn't get an update because of bad
input
--> 620 raise ValueError('Derivative expects Symbol [,
Integer] args but got %s, %s' % (s, count))
621
622 symbol_count.append((s, count))
ValueError: Derivative expects Symbol [, Integer] args but got 0, 1
which is a test failure in the tutorial.
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