from collections import defaultdict
def list_to_dict():
a_dict = defaultdict(list)
for key, value in a_list:
a_dict[key].append(value)
return a_dictfrom collections import defaultdict
def list_to_dict():
a_dict = defaultdict(list)
for key, value in a_list:
a_dict[key].append(value)
return a_dict