[graph-tool] install graph tool in Mac OS X 10.10

hi all, i install graph tool in OS X 10.10 using command "sudo port install py-graph-tool" and i succeed but when i use graph tool, i must use python under root mode; how can i excute the python code under normal account mode without root privilege? also, when i use "from graph_tool.all improt *", i get "cannot import GTK+ module" error, but nevermind, it can still draw graph picture using other modules. thanks Zhao Jun