流程图（二）利用python绘制网络图

流程图（二）利用python绘制网络图

网络图（Network chart）简介

网络图使用节点和连接线来显示事物之间的连接关系，用于说明实体之间的关系。一般分为定向网络图和非定向网络图。

快速绘制

1. 基于pyecharts

   from pyecharts import options as opts
   from pyecharts.charts import Graph
   
   nodes = [
       {
        "name": "结点1", "symbolSize": 10},
       {
        "name": "结点2", "symbolSize": 20},
       {
        "name": "结点3", "symbolSize": 30},
       {
        "name": "结点4", "symbolSize": 40},
       {
        "name": "结点5", "symbolSize": 50},
       {
        "name": "结点6", "symbolSize": 40},
       {
        "name": "结点7", "symbolSize": 30},
       {
        "name": "结点8", "symbolSize": 20},
   ]
   links = []
   for i in nodes:
       for j in nodes:
           links.append({
        "source": i.get("name"), "target": j.get("name")})
   c = (
       Graph()
       .add("", nodes, links, repulsion=8000)
       .set_global_opts(title_opts=opts.TitleOpts(title="基本网络图"))
   )
   
   c.render_notebook()
   

   

2. 基于networkx

   import pandas as pd
   import numpy as np
   import networkx as nx
   import matplotlib.pyplot as plt
    
   # 自定义数据
   df = pd.DataFrame({
         'from':['A', 'B', 'C','A'], 'to':['D', 'A', 'E','C']})
    
   # 构造网络图数据格式
   G=nx.from_pandas_edgelist(df, 'from', 'to')
    
   # 绘制网络图
   nx.draw(G, with_labels=True)
   plt.show()
   

   

定制多样化的网络图

自定义网络图一般是结合使用场景对相关参数进行修改，并辅以其他的绘图知识。参数信息可以通过官网进行查看，其他的绘图知识则更多来源于实战经验，大家不妨将接下来的绘图作为一种学习经验，以便于日后总结。

通过pyecharts绘制多样化的网络图

1. 点线网络

   import requests
   import json
   from pyecharts import options as opts
   from pyecharts.charts import Graph
   
   # 获取官方的数据
   url = "https://raw.githubusercontent.com/pyecharts/pyecharts-gallery/master/Graph/weibo.json"
   
   response = requests.get(url)
   j = json.loads(response.text)
   nodes, links, categories, cont, mid, userl = j
   
   c = (
       Graph()
       .add(
           "",
           nodes,
           links,
           categories,
           repulsion=50,
           linestyle_opts=opts.LineStyleOpts(curve=0.2),
           label_opts=opts.LabelOpts(is_show=False),
       )
       .set_global_opts(
           legend_opts=opts.LegendOpts(is_show=False),
           title_opts=opts.TitleOpts(title="微博转发关系网络"),
       )
   )
   
   c.render_notebook()
   

   

2. 球状网络

   import pyecharts.options as opts
   from pyecharts.charts import Graph
   
   # 获取官方的数据
   url = <