Why is [0:4], [4:6] and [6:8] needed for this?

Question

import datetime

class User:
def __init__(self, full_name, birthday):
self.name = full_name
self.birthday = birthday

def age(self):
today = datetime.date(2020, 4, 4)
yyyy = int(self.birthday[0:4])
mm = int(self.birthday[4:6])
dd = int(self.birthday[6:8])
dob = datetime.date(yyyy, mm, dd)

age_in_years = (today-dob).days
return int(age_in_years)

user = User("Aaditya Pageni", "20011206")
print(user.age())

Answer 1

Birthday is the string "20011206".

Start up a Python interpreter. At the ">>>" prompt, type:

birthday = "20011206"

and hit Enter. Now enter print(birthday) to check that it is the result that you expect.

Now do:

birthday[0:4]

What do you get?

How about birthday[4:6] and birthday[6:8]?

Is it clear now?

Answer 2

Don't know if you got there, but if you had, take time for a review.

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2453/