Updates:
Status: Invalid
Comment #6 on issue 1312 by mattpap: provide a way to calculate the
constant coefficient of a polynomial
http://code.google.com/p/sympy/issues/detail?id=1312
This can be done is several different ways, depending on the form of input
and
desired efficiency (e.g. core algorithm, user script):
In [1]: import sympy
In [2]: sympy.sympify('1')
Out[2]: 1
In [3]: sympy.sympify(1)
Out[3]: 1
In [4]: sympy.Integer(1)
Out[4]: 1
In [5]: sympy.S.One
Out[5]: 1
In [6]: sympy.S(1)
Out[6]: 1
Note also that sympy's Integer has different hash from equivalent python's
int:
In [7]: hash(_)
Out[7]: -1303377904
In [8]: hash(1)
Out[8]: 1
That's why sympy.collect(f,x,evaluate=False)[1] fails.
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