将值循环到函数中并将结果保存在数据框中

Question

我正在使用一个名为 "cdindex" 的 python 包，它在 network/graph 结构（节点和边）中获取数据，并在创建图形后生成一些整数属性节点。

按照包示例，我创建了如下节点（这里是顶点）和边数据：

>>> $ pip install cdindex
>>> import cdindex
>>> import datetime

>>> # dummy vertices for python module tests
>>> pyvertices= [{"name": "0Z", "time": datetime.datetime(1992, 1, 1)},
                 {"name": "1Z", "time": datetime.datetime(1992, 1, 1)},
                 {"name": "2Z", "time": datetime.datetime(1993, 1, 1)},
                 {"name": "3Z", "time": datetime.datetime(1993, 1, 1)},
                 {"name": "4Z", "time": datetime.datetime(1995, 1, 1)},
                 {"name": "5Z", "time": datetime.datetime(1997, 1, 1)},
                 {"name": "6Z", "time": datetime.datetime(1998, 1, 1)},
                 {"name": "7Z", "time": datetime.datetime(1999, 1, 1)},
                 {"name": "8Z", "time": datetime.datetime(1999, 1, 1)},
                 {"name": "9Z", "time": datetime.datetime(1998, 1, 1)},
                 {"name": "10Z", "time": datetime.datetime(1997, 1, 1)}]

>>> # dummy edges for python module tests
>>> pyedges = [{"source": "4Z", "target": "2Z"},
               {"source": "4Z", "target": "0Z"},
               {"source": "4Z", "target": "1Z"},
               {"source": "4Z", "target": "3Z"},
               {"source": "5Z", "target": "2Z"},
               {"source": "6Z", "target": "2Z"},
               {"source": "6Z", "target": "4Z"},
               {"source": "7Z", "target": "4Z"},
               {"source": "8Z", "target": "4Z"},
               {"source": "9Z", "target": "4Z"},
               {"source": "9Z", "target": "1Z"},
               {"source": "9Z", "target": "3Z"},
               {"source": "10Z", "target": "4Z"}]

接下来，我创建了图形并向其添加了节点（这里是顶点）和边：

>>> # create graph
>>> graph = cdindex.Graph()

>>> # add vertices
>>> for vertex in pyvertices:
      graph.add_vertex(vertex["name"], cdindex.timestamp_from_datetime(vertex["time"]))

>>> # add edges
>>> for edge in pyedges:
      graph.add_edge(edge["source"], edge["target"])

代码运行良好，我能够启动“graph.cdindex”函数来获取节点（在示例中为 4Z）的 cdindex 作为整数值在输出中（即 0.833）。

>>> graph.cdindex("4Z", int(datetime.timedelta(days=1825).total_seconds()))
[Out] 0.8333333333333333

我的问题

我想了解如何将多个值循环到“graph.cdindex”函数并将结果保存在数据框中。从技术上讲，我想循环许多其他字符串值（0Z、1Z、2Z、...）的列，而不是上述函数中的“4Z”字符串值，并保存它们的关联 cdindex 新列中的值。

可交付

所有节点 (Node_Name) 及其 cdindex 值 (cdindex_Value) 的数据帧，如下所示：

+-----------+---------------+
| Node_Name | cdindex_Value |
+-----------+---------------+
| 0Z        | 0.247         |
+-----------+---------------+
| 1Z        | 0.654         |
+-----------+---------------+
| 2Z        | -0.547        |
+-----------+---------------+
| 3Z        | 0.0           |
+-----------+---------------+
| 4Z        | 0.8333        |
+-----------+---------------+

Answer 1

您可以使用列表理解来获取所有顶点和关联的 cindex 值：

tuples = [(v, graph.cdindex(v, int(datetime.timedelta(days=1825).total_seconds()))) for v in graph.vertices()] # check how to get the vertices name

df = DataFrame(tuples, columns=['node', 'cindexvalue'])

将值循环到函数中并将结果保存在数据框中

Loop a value into function and save the results in dataframe

python

loops

graph

dataframe