Python library for working with simple equations

[lallous]

Hello

Is there is any Python library that allow such things:

Given a string expression as: x + 5 + x * (y + 2), any library that
can develop the equation for example.
Or if we say factor with "x" then it renders the expression with x *
( rest of expression ).
There could be a functionality where when x,y are given then the
expression can be evaluated.
If there are two expressions, they can be added and the symbols
preserved.

Does such a thing exist?

Thanks,
Elias

 

[Chris Rebert]

Hello

Is there is any Python library that allow such things:

Given a string expression as: x + 5 + x * (y + 2), any library that
can develop the equation for example.
Or if we say factor with "x" then it renders the expression with x *
( rest of expression ).
There could be a functionality where when x,y are given then the
expression can be evaluated.
If there are two expressions, they can be added and the symbols
preserved.

Does such a thing exist?

They're called computer algebra systems:
http://en.wikipedia.org/wiki/Computer_algebra_system

SymPy is one for Python:
http://code.google.com/p/sympy/

Don't know if it supports factoring specifically; I've never used it,
I just have Google-Fu.

Cheers,
Chris

 

[Daniel Fetchinson]

Given a string expression as: x + 5 + x * (y + 2), any library that

can develop the equation for example.
Or if we say factor with "x" then it renders the expression with x *
( rest of expression ).
There could be a functionality where when x,y are given then the
expression can be evaluated.
If there are two expressions, they can be added and the symbols
preserved.

Take a look at sage: http://www.sagemath.org/
I wouldn't say it's simple, in fact it's huge, but it'll do the job.

Cheers,
Daniel

 

[Daniel Fetchinson]

Given a string expression as: x + 5 + x * (y + 2), any library that

Take a look at sage: http://www.sagemath.org/
I wouldn't say it's simple, in fact it's huge, but it'll do the job.

Probably you can isolate the part of sage that you actually need and
can throw away 95% of it.

HTH,
Daniel

 

[geremy condra]

Hello

Is there is any Python library that allow such things:

Given a string expression as: x + 5 + x * (y + 2), any library that
can develop the equation for example.
Or if we say factor with "x" then it renders the expression with x *
( rest of expression ).
There could be a functionality where when x,y are given then the
expression can be evaluated.
If there are two expressions, they can be added and the symbols
preserved.

Does such a thing exist?

Thanks,
Elias

From sage:

.... (x + 1)*x

Geremy Condra