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this video explains how to calculate the sum by group in appenders data frame using the python programming language so without too much talk lets dive into the python code for this video we first need to import the pandas library as you can see in the first line of code and then we also need to create an example data frame using the data frame constructor as you can see in the next lines of code so after running these lines of code a new data frame called data is created and this data frame contains four columns whereby the first two columns x1 and x2 contain numeric values and the third and fourth columns group 1 and group 2 are group indicators now lets assume that we want to calculate the sum for each column and each group in the group indicator group 1. then we can apply the code that you can see in the third code box so in this line of code im applying the group by function within this function im specifying our group indicator group 1 and then im applying the sum function t