Hi.
The easiest way to do this is to use .args:
In [1]: a = (x + 2)*(x + 1)**2
In [2]: a
Out[2]:
2
(1 + x) ⋅(2 + x)
In [3]: a.args
Out[3]:
⎛ 2 ⎞
⎝(1 + x) , 2 + x⎠
In [4]: a.args[0]
Out[4]:
2
(1 + x)
In [5]: a.args[0].expand()*a.args[1]
Out[5]:
⎛ 2⎞
(2 + x)⋅⎝1 + 2⋅x + x ⎠
Aaron Meurer
On Jun 15, 2010, at 12:31 PM, nelson wrote:
> hi all!
> i am evaluating sympy for a project i'm doing. Basically i want to
> be able to extract a part of an expression, for examplre (x+1)^2 out
> of (x+2)*(x+1)^2 and performing an operation on it. For example,,
> expanding the (x+1)^2 term wold return the expression
> (x+2)*(x^2+2*x+1)
>
> is it possibile using sympy? how can i accomplish this task?
>
> thanks in advance,
> Andrea
>
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