Convert sympy expression to standard python

[Alan Bromborsky]

What is the simplest way of converting a sympy expression (formula) to a
standard python expression for the purpose of evaluation using tools
such as numpy. That is convert all the sympy variables and functions to
python variables and functions similar to fcode and ccode, but for
python and doing it within the program as opposed to writing to a file
(printing).

[krastano...@gmail.com]

Check lambdify.

I have much to say *against* the way it is written and how it acts on
corner cases, but for simple stuff it works well.

It just prints the expressions to a string and uses eval() on that
string. It can "compile" to python.math, numpy and mpmath.

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[krastano...@gmail.com]

In [1]: f = lambdify([x,y], sin(x)*y)

In [2]: f
Out[2]: <function numpy.<lambda>>

In [3]: f(3.1415/2, 2)
Out[3]: 1.999999997853828