运行Python 3.5.0的Windows 8中的流程图

import matplotlib.pyplot as plt
import pygraphviz as pgv

# 创建流程图对象
graph = pgv.AGraph(directed=True)

# 添加节点
graph.add_node("开始")
graph.add_node("步骤1")
graph.add_node("步骤2")
graph.add_node("结束")

# 添加边
graph.add_edge("开始", "步骤1")
graph.add_edge("步骤1", "步骤2")
graph.add_edge("步骤2", "结束")

# 设置节点的形状和颜色
graph.get_node("开始").attr["shape"] = "box"
graph.get_node("开始").attr["color"] = "green"

# 设置节点的标签
graph.get_node("步骤1").attr["label"] = "执行步骤1"

# 设置边的颜色和标签
graph.get_edge("开始", "步骤1").attr["color"] = "blue"
graph.get_edge("开始", "步骤1").attr["label"] = "开始到步骤1"

# 绘制流程图
graph.draw("flowchart.png", prog="dot", format="png")

# 保存流程图
graph.write("flowchart.dot")