python graphviz Chinese garbled code problem and its solution ：

Source code ：

dot_data = tree.export_graphviz(clf
                                , feature_names=feature_name
                                , class_names=[" Harbin Beer ", " Qingdao wine ", " Guangxi wine "]
                                , filled=True
                                , rounded=True)


graph=graphviz.Source(dot_data)
os.environ["PATH"] += os.pathsep + 'D:/DiyProgram/graphviz/bin/'
graph.render("wine", view=True)

Modify the code ：

dot_data = tree.export_graphviz(clf
                                , feature_names=feature_name
                                , class_names=[" Harbin Beer ", " Qingdao wine ", " Guangxi wine "]
                                , filled=True
                                , rounded=True
                                , special_characters=True
                                , fontname="Microsoft YaHei")


graph=graphviz.Source(dot_data)
os.environ["PATH"] += os.pathsep + 'D:/DiyProgram/graphviz/bin/'
graph.render("wine", view=True)