Aaron, thanks for responding to my question in detail.
On 30/06/2020 20:00, Aaron Meurer wrote:
The printer doesn't take into account your namespace. It is
copy-pastable from the point of view of having all the SymPy names
imported. We could add a string printer mode that prefixes all SymPy
names.
Thanks, I wasn't aware that print() works that way.
The problem seems to remain that if you integrate sin(x) you get cos(x),
yo get a symbol cos that you didn't anticipate. Maybe integrating
sin(x**3) would be a better example, where hypergeometrics and gamma
functions suddenly appear in the answer - I mean these will appear
without regard to the selective importing of SymPy. Thus if you
copy/paste these into an input, these will generate an undefined name
error because they are not prefixed.
If you don't like using sym.cos and so on everywhere, you can just
import things directly, like
from sympy import cos
Precisely - as explained above.
I mean, is copy/paste an unusual thing to use - I would have thought it
was completely normal.
I don't know Python anywhere near well enough to figure out if it is
possible for print() or something else, like fullprint() to add
appropriate prefixes (like sp.) to things (not just every possible
prefix) as it outputs them - can it extract enough information to
actually do this?
My suggestion to use "from sympy import *" within modules was meant to
apply in a situation where you used a collection of modules for various
purposes which all imported just SymPy. I can't quite see what the
problem is in that case, unless you use Python tools.
Even without using *, it is still possible to accidentally import
something from more than one module:
from sympy import sin
from numpy import sin
Indeed if you are going to use numpy in conjunction with sympy, this
sort of clash seems quite inevitable unless you make all the numpy
symbols work using the np. prefix.
BTW, I really do not wish to be a nuisance, because I do realise what a
magnificent facility SymPy represents, and the work that must have gone
into it.
David
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