Classes in python

Question

class student:
cars=12
harry=student()
harry.age=26
print(harry.__dict_)

why does not this program print cars =12 too instead of printing only age=26 ??
but ,
print(harry.cars) will print 12.

Answer 1

because object members and object attributes are two different things:

attributes are accessed by dot notation, while members are accessed by square bracket notation (as indices in list, or keys in dict).

an instance __dict__ attribute store only all members of it (by key/value pairs).

you can get more information about that by reading this stackoverflow discuss:

https://stackoverflow.com/questions/30250282/whats-the-difference-between-the-square-bracket-and-dot-notations-in-JUMP_LINK__&&__python__&&__JUMP_LINK

Answer 2

You need to use

def __init__(self, cars, age):
self.cars=12
self.age=26