Python sum on keys for List of Dictionaries [duplicate]

Answer 1

from collections import defaultdict

c = defaultdict(int)
for d in list_of_dictionaries:
    c[d['Name']] += d['amt']

It produces c:

{'A': 1000, 'C': 900, 'B': 200}

To convert it to list of dictionaries:

[{'Name': name, 'amt': amt} for name, amt in c.items()]

Result:

[{'Name': 'A', 'amt': 1000}, {'Name': 'C', 'amt': 900}, {'Name': 'B', 'amt':200}]