Thank you, it worked well. I can't find how in sympy i can obtain the entire expression parsing tree. I want to be able to navigate from my app, selecting part of the expression (having the expression tree and navigation functions, this would be very easy), and applying to this expression some operation.
Is there some common approach to this problem? thanks On Jun 15, 11:15 pm, "Aaron S. Meurer" <asmeu...@gmail.com> wrote: > Hi. > > The easiest way to do this is to use .args: > > In [1]: a = (x + 2)*(x + 1)**2 > > In [2]: a > Out[2]: > 2 > (1 + x) ⋅(2 + x) > > In [3]: a.args > Out[3]: > ⎛ 2 ⎞ > ⎝(1 + x) , 2 + x⎠ > > In [4]: a.args[0] > Out[4]: > 2 > (1 + x) > > In [5]: a.args[0].expand()*a.args[1] > Out[5]: > ⎛ 2⎞ > (2 + x)⋅⎝1 + 2⋅x + x ⎠ > > Aaron Meurer > On Jun 15, 2010, at 12:31 PM, nelson wrote: > > > > > > > > > hi all! > > i am evaluating sympy for a project i'm doing. Basically i want to > > be able to extract a part of an expression, for examplre (x+1)^2 out > > of (x+2)*(x+1)^2 and performing an operation on it. For example,, > > expanding the (x+1)^2 term wold return the expression > > (x+2)*(x^2+2*x+1) > > > is it possibile using sympy? how can i accomplish this task? > > > thanks in advance, > > Andrea > > > -- > > You received this message because you are subscribed to the Google Groups > > "sympy" group. > > To post to this group, send email to sy...@googlegroups.com. > > To unsubscribe from this group, send email to > > sympy+unsubscr...@googlegroups.com. > > For more options, visit this group > > athttp://groups.google.com/group/sympy?hl=en. -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sy...@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
