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Alex Germain
Alex Germain

Reputation: 441

Python, concatenate multiple rows into one

Is there any way to concatenate multiple rows into one as the exemple below:

   Name   Date_1     Date_2     Date_3
0  name1     11        NaT       NaT
1  name1     NaT       12        NaT
2  name1     NaT       NaT       43
3  name2     12        NaN       NaT
4  name2     NaT       Text      NaT

So it could be NaT or NaN.

I'm looking to it: 

 Name   Date_1     Date_2     Date_3
 name1     11        12        43
 name2     12        Text       NaT

Thanks in advance

Upvotes: 1

Views: 1136

Answers (1)

kfoley
kfoley

Reputation: 340

You haven't stated how you want to handle duplicates but to get the min/max you can use the following:

import pandas as pd

df = pd.DataFrame(
    [
        {"name": "name1", "date_1": 11},
        {"name": "name1", "date_2": 12},
        {"name": "name1", "date_3": 43},
        {"name": "name2", "date_1": 12},
    ],
    columns=["name", "date_1", "date_2", "date_3"],
)

df.groupby('name').max().reset_index()

which gives:

    name  date_1  date_2  date_3
0  name1    11.0    12.0    43.0
1  name2    12.0     NaN     NaN

Upvotes: 3

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