Pandas Dataframe.groupby() method is used to split the data into groups based on some criteria. The abstract definition of grouping is to provide a mapping of labels to the group name.
To concatenate string from several rows using Dataframe.groupby(), perform the following steps:
- Group the data using Dataframe.groupby() method whose attributes you need to concatenate.
- Concatenate the string by using the join function and transform the value of that column using lambda statement.
We will use the CSV file having 2 columns, the content of the file is shown in the below image:
Example 1: We will concatenate the data in the branch column having the same name.
Example 2: We can perform Pandas groupby on multiple columns as well.
We will use the CSV file having 3 columns, the content of the file is shown in the below image:
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