[('Visa', 980.5), ('Rogers', 61.5), ('Visa', 215.0)]
for example, I have the list of tuples above, how can i find the duplicates(i.e 'Visa') and sum their values (i.e 980.5+215.0)? The output should be:
[('Visa', 1195.5), ('Rogers', 61.5)]
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