fraction() only takes the numerator and denominator of the top-level expression, without doing any simplification. It should be used in places where you don't care about subexpressions and want something very fast. as_numer_denom() simplifies subexpressions when extracting numerator and denominator. An example demonstrates the difference:
>>> fraction(1/(1/x + 1)) (1, 1 + 1/x) >>> (1/(1/x + 1)).as_numer_denom() (x, x + 1) Aaron Meurer On Fri, Mar 19, 2021 at 2:36 PM Paul Royik <distantjob...@gmail.com> wrote: > > And why one needs both these methods? > > -- > 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 sympy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/8cbc06f0-a4fe-4908-9e85-3fda91e1e979n%40googlegroups.com. -- 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 sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6KyP%3De4COVbUSpAnszHGwQEwnqVhdsiTrj5LNR%3Dq3x1Qw%40mail.gmail.com.
