i have dataframe in pandas:
age interventiontype primarypurpose 0 [adult, senior] device treatment 1 [child, adult, senior] drug basic science 2 [adult, senior] drug treatment 3 [adult, senior] nan nan 4 [adult, senior] other nan
and want to pivot on interventiontype, such get:
drug adult 2 senior 2 child 1 device adult 1 senior 1 other adult 1 senior 1
how accomplish this? also, non-standard dataframe have lists? if so, practice "de-list" lists?
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