How to replace elements of a Python list?

Question

Python

Script

data = {(1, 'USD_RUB'), (2, 'EUR_RUB')}
def exmo_func():
    for pair in data:
        pair[1].replace('RUB', 'RUR')
    print(data)

outputs the same sequence as before the loop.
I'm assuming this is because the replace method modifies the slice, not the element.
I'm new to python, please help.
How would you change the script to replace all RUB in the data list with RUR?

Answer 1

data = {(i[0], i[1].replace('RUB', 'RUR')) for i in data}

Answer 2

AlmazKayum ,
strings are immutable data type