csv.py

from collections import defaultdict
str = '''company_name,service
Johns Refuge,Normal Pickup
Johns Refuge,Bulk Pickup
Johns Refuge,Tree Removal
Bobs Limited,Normal Pickup
Bobs Limited,Bulk Pickup
'''
lines = str.split("\n")
data = lines[1:-1]
ddict = defaultdict(list)
for str in data:
    company, services = str.split(",")
    ddict[company].append(services)

for company, services in ddict.items():
    print(company + ',' + '"' + ','.join(services) + '"')