graphviz-2.38.msi（windows下python图形工具）
用于python中，某些图形的显示。Note:TheseVisualStudiopackagesdonotalterthePATHvariableoraccesstheregistryatall.Ifyouwishtousethecommand-lineinterfacetoGraphvizorareusingsomeotherprogramthatcallsaGraphvizprogram,youwillneedtosetthePATHvariableyourself.