Classes and Objects - question

[AI_ML_Neophyte]

Hi,

I'm teaching myself Python and am having trouble with Classes and Objects.

Please see below my Python Code.

I'm struggling to figure out how to create a weight1 field that gives weight in Kgs.

Two specific questions:
1) How do I create the weight1 field?
2) Why does the invocation of age have "age()"?

thanks in advance

PC

# Create an object to compute John's weight in Kgs as well as age in years
class User:
    def __init__(self, full_name, weight, birthday):
        self.name = full_name
        self.weight = weight
        self.birthday = birthday
    
    def age(self):
        today = datetime.date(2018, 12, 5)
        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_days = (today-dob).days
        age_in_years = age_in_days/365
        
        return int(age_in_years)
        
    def weight1(self):
        weight_in_kgs = weight/0.454
        return int(weight_in_kgs)