线图中的seaborn多条线

Question

I have a dataframe looks like the following:

location	1/1/21	1/2/21	1/3/21	another_var
A	13	15	18	0.25
B	1	4	4	0.28
C	3	3	3	0.3

location column is the index column How can I make a seaborn lineplot with three lines (A, B, C) and dates on the x-axis? I tried to do df.columns but I don't know how to exclude the last column (since it's not a date column)

Answer 1

You melt a subset of the dataframe to give you something in the long format:

import pandas as pd
import seaborn as sns

df = pd.DataFrame({'1/1/21':[13,1,3],"1/2/21":[15,4,3],"1/3/21":[18,4,3],
"another_var":[0.25,0.28,0.3]},index=["A","B","C"])

df.iloc[:,:-1].reset_index().melt(id_vars="index")

    index   variable    value
0   A   1/1/21  13
1   B   1/1/21  1
2   C   1/1/21  3
3   A   1/2/21  15
4   B   1/2/21  4
5   C   1/2/21  3
6   A   1/3/21  18
7   B   1/3/21  4
8   C   1/3/21  3

And you plot this:

sns.lineplot(data = df.iloc[:,:-1].reset_index().melt(id_vars="index"),
             x = "variable" , y = "value" , hue = "index")