Python script for user defined model

Hi,

I am trying to use the Python script to set my material model and properties. For example, If I try to set material properties for the user-defined Drucker-Prager model:

material1 = g_i.soilmat()
material1.setproperties(
"MaterialName", "1",
"SoilModel", 100,
"UserDLLName", "example_ivf64.dll",
"UserModel", "DP",
"gammaUnsat", 100,
"gammasat", 105)

How to set the material properties such as "G", "nu", "Alpha", "Beta", "C"? Thanks!