python - Multidicts and Sets -

i have n csv's created multidict with:

for name in filenames:     open(path+name) openfile:     reader = csv.reader(openfile)     line in reader:         if line[1] in t:             pass         elif line[1] == 'filer_name':             pass         else:             t[name[:-8]].add(line[1]) 

this works , outputs multidict (from collections import defaultdict) form:

{company name: {other_company_1, other_company_2,...}} 

there n companies n sets of other companies. now, want other_company in each key, check if other_company in values of company. example:

defaultdict(<class 'set'>, {apple : {samsung, qualcomm, nvidia}},{microsoft: {samsung, alcoa, dollar tree}}) 

i want samsung returned, needs search each set of values every key. if dollar tree in values of third company, find dollar tree too.

attempt @ solution:

for key, values in t.items():     item in values:         if item in values:             print(item) 

additionally, there way return other_company if occurs 3 or more times? 4 or more times? m or more times? in multidict.

cheers!

use counter:

from collections import counter cnt = counter() key, values in t.items():     item in values:         cnt[item] += 1  print([comp comp in cnt if cnt[comp] > 1]) 

you can change 1 2,3 if want n occurrences.