我试图弄清楚如何计算给定的2个字符串组合,而不管哪个字符串是第一/第二。
这是我的代码:
import pandas as pd
mylist = [[('Smith JR', 'Kim YY'), ('Smith JR', 'Ron AA'), ('Kim YY', 'Ron AA')],
[('Kim YY', 'Smith JR')], [('Smith JR', 'Ron AA')]]
flat_list = [item for sublist in mylist for item in sublist]
df = pd.DataFrame(flat_list, columns=["From", "To"])
df_graph = df.groupby(["From", "To"]).size().reset_index()
df_graph.columns = ["From", "To", "Count"]
print(df_graph)
给出:
From To Count
0 Kim YY Ron AA 1
1 Kim YY Smith JR 1
2 Smith JR Kim YY 1
3 Smith JR Ron AA 2
但是由于Kim YY Smith JR和Smith JR Kim YY在我希望给予的两个人之间建立了联系:
From To Count
0 Kim YY Ron AA 1
1 Kim YY Smith JR 2
2 Smith JR Ron AA 2
我已经看到了许多解决方案,它们可以删除重复的行,但是并没有按照我的期望合并每行的计数。我似乎无法弄清楚如何结合
1 Kim YY Smith JR 1
2 Smith JR Kim YY 1
行仅保留Kim YY-Smith JR行且Count为2。此外,在我的实际数据中,给定行的计数可以大于1。
答案 0 :(得分:5)
将两列排序在一起,然后再添加到数据框中,以确保一对将仅以特定顺序出现。然后才应用您的计数方法。使用link中的方法进行排序:
import pandas as pd
import networkx as nx
mylist = [[('Smith JR','Kim YY'),('Smith JR','Ron AA'),('Kim YY','Ron AA')],[('Kim YY','Smith JR')],[('Smith JR','Ron AA')]]
flat_list = [item for sublist in mylist for item in sublist]
df = pd.DataFrame(flat_list, columns=["From", "To"])
#create a new dataframe with the value pairs sorted. You can also sort earlier if you prefer.
df = pd.DataFrame(np.sort(df[["From", "To"]]), columns = ["From", "To"])
#now, just apply the groupby.
df_graph = df.groupby(["From", "To"], axis=0).size().reset_index()
#Output:
From To 0
0 Kim YY Ron AA 1
1 Kim YY Smith JR 2
2 Ron AA Smith JR 2
答案 1 :(得分:3)
但不要那么脏
pd.value_counts([*map(frozenset, zip(df.From, df.To))])
(Smith JR, Ron AA) 2
(Kim YY, Smith JR) 2
(Kim YY, Ron AA) 1
dtype: int64