Hi,

Here is a brief example on how to use expy to implement the math module: (for more details, see http://expy.sf.net/)

"""Python math module by expy-cxpy.""" from expy import * expymodule(__name__)

#includes, defines, etc. @prologue def myprolog(): return """ #include """

@function(double) #return type: double def sqrt(x=double): #argument x: double """sqrt(x) --> the square root of x.""" return "sqrt(x)" #as an expression

#a more terse way @function(double) def sin(x=double): """sin(x) --> the sin of x.""" pass #the deduced call: sin(x)

#more functions ...

expymodule(__name__) #end of module