Aggregation

$group

group(field | index[, multi])

See also: http://rethinkdb.com/api/python/group/

$count

count()

See also: http://rethinkdb.com/api/python/count/

$sum

sum(field)

See also: http://rethinkdb.com/api/python/sum/

$avg

avg(field)

See also: http://rethinkdb.com/api/python/avg/

$min

min(field)

See also: http://rethinkdb.com/api/python/min/

$max

max(field)

See also: http://rethinkdb.com/api/python/max/