python - access all dictionary elements not corresponding to key

Question

I'm trying to write code to compute pairwise differences in a bunch of data within and between groups. That is, I've loaded the data into a dictionary so that the ith value of data j in group k is accessible by

data[j][group[k]][i]

I've written for loops to calculate all of the within group pairwise differences, but I'm a little stuck on how to then calculate the between groups pairwise differences. Is there a way to compare all of the values in data[j][group[k]] to all of the values in data[j][*NOT*group[k]] ? Thanks for any suggestions.

Answer 1

You Could compare them all and then throw out the ones where the group is the same as the one being compared to. (I hope that makes sense)

Or

make a temporary group[l] equal to group[k] minus the instance you are comparing to.