Count the duplicates in a list of tuples

Question

I have a list of tuples: a = [(1,2),(1,4),(1,2),(6,7),(2,9)] I want to check if one of the individual elements of each tuple matches the same position/element i

Answer 1

Using pandas this is simple and very fast:

import pandas
print(pandas.Series(data=[(1,2),(1,4),(1,2),(6,7),(2,9)]).value_counts())

(1, 2)    2
(1, 4)    1
(6, 7)    1
(2, 9)    1
dtype: int64