How to find and group elements in a row?

Question

Python

I have if a sequence of characters (let each element be a string)
aa lot bb obj obj obj cc lot obj gg lot obj obj

I need to find out how many objects are in each lot. And get something like the output:
[lot 3 obj] [lot 1 obj] [lot 2 obj]

There is garbage in the string - all other characters except obj and lot. We do not take it into account. The delimiter of each section is a new `lot`.

How to do?

Answer 1

separator = 'lot'
item = 'obj'
count = [ n.count(item) for n in s.split(separator)[1:] ]

print(' '.join(f'[{separator} {n} {item}]' for n in count))