Adding values with reduce() function from the list of tuples

[DeaD_EyE]

Firstly, the name of the list should not be named list because list is a built-in function.
To get the second values from the tuple, you must iterate over the data.

data = [
    ("Rachel", 19),
    ("Monica", 18),
    ("Phoebe", 17),
    ("Joey", 16),
    ("Ross", 20),
    ("Chandler", 21),
]


for elements in data:
    print(elements)
    # ("Rachel",19) ...

for elements in data:
    print(elements[1])  # print second element

for name, age in data:
    print(age)
    # but name is not used, so you can assgn it the the thow away variable _


for _, age in data:
    print(age)

Or if you want to create a new list only with the second values of the tuples:

from operator import itemgetter

def get(data, index):
    getter = itemgetter(index)
    return [getter(values) for values in data]

# without itemgetter
def get(data, index):
    return [values[index] for values in data]


data = [
    ("Rachel", 19),
    ("Monica", 18),
    ("Phoebe", 17),
    ("Joey", 16),
    ("Ross", 20),
    ("Chandler", 21),
]

ages = get(data, 1)