Sum similar items

[deanhystad]

Treat it just like a regular dictionary.

import collections

values = ['DV1', 'PHQ', 'ATC', 'ATC', 'ATC', 'PHQ', 'DG2', 'TGP_H', 'PHQ', 'PHQ', 'TCP_H', 'TCP_H']
count = collections.Counter(values)

print(count)
for key, value in count.items():
    print(key, ':', value)

Output:
Counter({'PHQ': 4, 'ATC': 3, 'TCP_H': 2, 'DV1': 1, 'DG2': 1, 'TGP_H': 1})
DV1 : 1
PHQ : 4
ATC : 3
DG2 : 1
TGP_H : 1
TCP_H : 2