Draw a Parametric Curve

import rhinoscriptsyntax as rsimport math# Something really interesting about this script is# that we are passing a function as a parameter函数的参数是一个函数名def DrawParametricCurve(parametric_equation):     "Create a interpolated curve based on a parametric equation."    # Get the minimum parameter    t0 = rs.GetReal("Minimum t value", 0.0)    if( t0==None ): return    # Get the maximum parameter    t1 = rs.GetReal("Maximum t value", 1.0)    if( t1==None ): return    # Get the number of sampling points to interpolate through    count = rs.GetInteger("Number of points", 50, 2)    if count<1: return    arrPoints = list()    #Get the first point    point = parametric_equation(t0)    arrPoints.append(point)    #Get the rest of the points    for x in xrange(1,count-2):        t = (1.0-(x/count))*t0 + (x/count)*t1        point = parametric_equation(t)        arrPoints.append(point)    #Get the last point    point = parametric_equation(t1)    arrPoints.append(point)    #Add the curve    rs.AddInterpCurve(arrPoints)#Customizable function that solves a parametric equationdef __CalculatePoint(t):    x = (4*(1-t)+1*t ) * math.sin(3*6.2832*t)    y = (4*(1-t)+1*t ) * math.cos(3*6.2832*t)    z = 5*t    return x,y,z########################################################################### Check to see if this file is being executed as the "main" python# script instead of being used as a module by some other python script# This allows us to use the module which ever way we want.if( __name__ == "__main__" ):    #Call the function passing another function as a parameter    DrawParametricCurve(__CalculatePoint)