Try this one:
n [1]: z = symbols('z')
In [2]: expr = 2*z
In [3]: e2 = expr.evalf()
In [4]: e2
Out[4]: 2.0⋅z
In [5]: def exact_float_to_int(x):
...: if isinstance(x, (float, Float)):
...: return Integer(x)
...: return x
...:
In [6]: from sympy.strategies.traverse import bottom_up
In [7]: bottom_up(exact_float_to_int)(e2)
Out[7]: 2⋅z
Explanation: SymPy expressions are trees (data structures), *bottom_up*
applies the defined function from the bottom nodes of the expression tree
up to the trunk.
On Monday, 14 September 2015 21:18:21 UTC+2, Christopher Ahern wrote:
>
> For an expression evalf converts integers to floats.
>
> z = symbols('z')
> expr = 2*z
> expr.evalf()
>
> This yields 2.0*z. Assuming that the coefficients in the expression are
> actually integers, is there a way to convert them from floats to integers
> in SymPy while leaving everything else as is?
>
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