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I can not retrieve the value of a variable created only by the inherited child class.
Also, changing the value of a variable inherited from the parent class in the init of the child class does not apply.

Here's the parent class:

class Car():

 def __init__(self, make, model, year):
 self.make = make
 self.model = model
 self.year = year
 self.odometer_reading = 0

 def __str__(self):
 return str(self.__class__) + ": " + str(self.__dict__)

 def get_descriptive_name(self):
 long_name = str(self.year) + ' ' + self.make + ' ' + self.model
 return long_name.title()

 def read_odometer(self):
 print("This car has " + str(self.odometer_reading) + " miles on it.")

 def update_odometer(self, mileage):
 if mileage >= self.odometer_reading:
 self.odometer_reading = mileage
 else:
 print("You can't roll back an odometer!")

 def increment_odometer(self, miles):
 self.odometer_reading += miles

And here's the child class:

class ElectricCar(Car):

 def __init___(self, make, model, year):
 super(ElectricCar, self).__init__(make, model, year)
 self.odometer_reading = 100
 self.battery_size = 70

 def __str__(self):
 return str(self.__class__) + ": " + str(self.__dict__)

 def describe_battery(self):
 print(self.battery_size)

Now, if I try to run this code:

my_tesla = ElectricCar('tesla', 'model s', 2016)
print(my_tesla)
print(my_tesla.describe_battery())

I get the following exception:

<class '__main__.ElectricCar'>:
'make': 'tesla', 'model': 'model s', 'year': 2016, 'odometer_reading': 0

AttributeError: 'ElectricCar' object has no attribute 'battery_size'

I have an oddmeter_reading variable whose value is 0 in the parent class.
I changed from child class to 100, but it did not apply.
Also, the variable battery_size, which is set only in the child class, is not created in init.

What's the problem? What am I missing?