There is a typo in your code: it should be "from_meijerg" instead of 

sage: from sympy.holonomic.holonomic import from_meijerg
sage: from_meijerg?
Signature: from_meijerg(func, x0=0, evalf=False, initcond=True, domain=QQ)
 Converts a Meijer G-function to Holonomic. "func" is the G-Function
 and "x0" is the point at which initial conditions are required.

 >>> from sympy.holonomic.holonomic import from_meijerg, 
 >>> from sympy import symbols, meijerg, S
 >>> x = symbols('x')
 >>> from_meijerg(meijerg(([], []), ([S(1)/2], [0]), x**2/4))
 HolonomicFunction((1) + (1)*Dx**2, x, 0, [0, 1/sqrt(pi)])
Init docstring: x.__init__(...) initializes x; see help(type(x)) for 
File: ~/sage/8.1/local/lib/python2.7/site-packages/sympy/holonomic/holonomic
Type: function

Best wishes,


Le vendredi 13 avril 2018 00:06:17 UTC+2, Raymond Rogers a écrit :
> The sympy documentation
> http://docs.sympy.org/latest/modules/holonomic/convert.html
>  has the function from_meiljer and I do 
> from sympy import *
> from sympy.holonomic.holonomic import from_hyper, from_meijer, 
> DifferentialOperators
> (I think redundant)
> I get: "ImportError: cannot import name from_meijer" 
> Is this a versioning error or what?

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