main_dict = {}
for email, category, value in main_list:
token = (email, category)
if token in main_dict:
main_dict[token] += int(value)
else:
main_dict[token] = int(value)
main_list_converted = []
for k, v in main_dict.iteritems():
main_list_converted.append(list(k) + [v])
main_list_converted.sort()
"""
for item in main_list_converted:
print (item)
[['user1@test.com', 'Administration', 100]
['user2@test.com', 'Development', 170]
['user2@test.com', 'Testing', 30]
['user3@test.com', 'Administration', 95]
['user3@test.com', 'Development', 400]
['user3@test.com', 'Testing', 200]]
"""
