Well, the good news is that SymPy will soon work in Python 3 (we've got a Google Summer of Code student working on it). He's making good progress with it, so it should be supported by our next release or the one after that.
And you can still do "class MyClass(object)" in Python 3, which is identical to "class MyClass:" there. So it's good to get into the habit of always typing "(object)" after your class definitions even in Python 3, so you won't accidentally create an old-style class in Python 2 (because unfortunately, you will still have to use Python 2 from time to time for a while). Aaron Meurer On Tue, Jul 5, 2011 at 1:19 PM, Adam Moore <[email protected]> wrote: > Thanks, the problem actually was that I was using an old-style class > instead of new style. I started learning Python with 3.2, so the issue > wasn't there and I didn't know to look out for it. Thanks again for > the help! > > Adam > > On Jul 4, 6:58 pm, Aaron Meurer <[email protected]> wrote: >> I think you mised the part where he said "when I create my own Symbol >> class," in other words, he is not using SymPy's Symbol in the second >> case but his own. >> >> Aaron Meurer >> >> >> >> >> >> >> >> On Mon, Jul 4, 2011 at 12:42 PM, Mateusz Paprocki <[email protected]> wrote: >> > Hi, >> >> > On 4 July 2011 20:33, Adam Moore <[email protected]> wrote: >> >> >> So when I import x from sympy.abc, and then check its 'type', its type >> >> is <class 'sympy.core.symbol.Symbol'> >> >> >> What makes this so? In a project I'm working on, I'm trying to learn >> >> some lessons from sympy as to how variables and such are handled, but >> >> when I create my own Symbol class and execute >> >> >> x = Symbol('x') >> >> >> and then check the type, its type is <type 'instance'> >> >> >> What is the nature of a Symbol in sympy then if it is not also an >> >> instance of a class? >> >> > Can you show a complete code sample? I get the following: >> > $ ipython >> > In [1]: from sympy import * >> > In [2]: x = Symbol('x') >> > In [3]: type(x) >> > Out[3]: <class 'sympy.core.symbol.Symbol'> >> > In [4]: del x >> > In [5]: from sympy.abc import x >> > In [6]: type(x) >> > Out[6]: <class 'sympy.core.symbol.Symbol'> >> > The abc module just uses Symbol(): >> > In [7]: from sympy import abc >> > In [8]: abc?? >> > Type: module >> > Base Class: <type 'module'> >> > String Form: <module 'sympy.abc' from 'sympy/abc.pyc'> >> > Namespace: Interactive >> > File: /home/matt/repo/git/sympy/sympy/abc.py >> > Source: >> > from core import Symbol >> > _latin = list('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ') >> > # COSINEQ should not be imported as they clash; gamma, pi and zeta clash, >> > too >> > _greek = 'alpha beta gamma delta epsilon zeta eta theta iota kappa '\ >> > 'mu nu xi omicron pi rho sigma tau upsilon phi chi psi omega'.split(' ') >> > for _s in _latin + _greek: >> > exec "%s = Symbol('%s')" % (_s, _s) >> > del _latin, _greek, _s >> > But anyway, in both cases x is an instance of Symbol class. >> >> >> -Adam >> >> >> -- >> >> You received this message because you are subscribed to the Google Groups >> >> "sympy" group. >> >> To post to this group, send email to [email protected]. >> >> To unsubscribe from this group, send email to >> >> [email protected]. >> >> For more options, visit this group at >> >>http://groups.google.com/group/sympy?hl=en. >> >> > Mateusz >> >> > -- >> > You received this message because you are subscribed to the Google Groups >> > "sympy" group. >> > To post to this group, send email to [email protected]. >> > To unsubscribe from this group, send email to >> > [email protected]. >> > For more options, visit this group at >> >http://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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
