Compare folder A and subfolder B and display files that are in folder A but not in su

[Pedroski55]

Try glob?

import glob
path1 = '/home/pedro/summer2021/**/'
path2 = '/home/pedro/summer2021/EC/*'
all_files1 = glob.glob(path1 + '*.odt')
all_files2 = glob.glob(path2 + '*.odt')
intersect = list(set(all_files1).intersection(set(all_files2))
exceptions = [f for f in all_files1 if not f in intersect]
len(exceptions) #26
len(all_files1) #33
len(intersection) #7

If memory is a problem you can use iglob()

all_files = glob.iglob(path + '*.odt')

iglob returns a generator, not a list.