How can I set the gmsh mesh size using the python API?

Question

I am using gmsh to generate tetrahedral meshes via a python script. In the current documentation, the setSize function to set the size of the mesh only supports entities of dimension 0 (e.g. points). Is there an alternative set of commands I can use to impose a minimum and maximum mesh size (e.g. side length of tetrahedral element)? Thanks in advance!