S() converts the string into a SymPy expression (short for sympify()). SymPy expressions are always stored as trees in memory (that's how they are represented, see http://docs.sympy.org/latest/tutorial/manipulation.html).
Aaron Meurer On Wed, Apr 6, 2016 at 6:02 PM, Nathan Hayden <[email protected]> wrote: > Excellent! This is exactly what I was looking for. > > Does S() return the tree in memory? > > On Wednesday, April 6, 2016 at 4:32:32 PM UTC-5, Nathan Goldbaum wrote: >> >> >> >> On Wed, Apr 6, 2016 at 4:09 PM, Nathan Hayden <[email protected]> wrote: >>> >>> Hi, I'm new to SymPy, but I'm using it to do some simple things already. >>> >>> I'm wondering, can I feed SymPy an expression and get a tree >>> representation back showing me the order of operations used to evaluate the >>> expression? I know this is all handled under the hood, but I don't know if >>> it's exposed. >>> >>> >>> For example, for the expression: 4 * 5 + 6 * (1 + 2) >>> >>> I'd like to get something like: >>> >>> + >>> / \ >>> * * >>> / \ / \ >>> 4 5 6 + >>> / \ >>> 1 2 >>> >>> Is this a thing? >> >> >> from sympy.printing.tree import print_tree >> from sympy import S >> >> print_tree(S(' 4 * 5 + 6 * (1 + 2)', evaluate=False)) >> >> I'm not sure there's a way to make it print like you want, but you should >> be able to whip something up following this: >> >> http://docs.sympy.org/latest/tutorial/manipulation.html >> >> (particularly the bits toward the bottom). >> >> -Nathan >> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "sympy" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/sympy. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/sympy/90597353-0ff0-42c8-a554-59f4b069cba2%40googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >> >> > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/96bc2f21-03a4-4cf7-8567-93bc43446c08%40googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6JmMZsUQPLoaOKe8TyOtQedM9q%2BP4r2Fp%2BmCstNS2cY2g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
