how to count duplicates in a list of tuples and append it as a new value

output = [('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO'),('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO'),('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO'),('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO'),('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO'),('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO')]

so here there are total of 6 set of ('studentA','ISDF'), ('studentB','CSE'),('studentC','BIO') in this above list

so Im expecting an output like this ~

expected_output = [('studentA','ISDF',6), ('studentB','CSE',6),('studentC','BIO',6)]

The format should be [('student', 'department', total count)]

>Solution :

Try this:

sorted([tuple(list(item)+[output.count(item)]) for item in set(output)])