Instantisation in Python

Question

I have just started learning to program in Python. I am finding it difficult to instance objects properly. It gives a traceback but I don't know why. I have been reading the documentation for 3.8 and still not sure what is causing the error? Your help is deeply appreciated.

Thank you.

 def _init_(self, name, age, character):
 self.name = name
 self.age = age
 self.character = character
 def date_of_birth():
 return 2020 - self.age
Breeds = Breeds = [Dog("Alsation", 2,["Protective","Smart"]), Dog("Rotteweiler", 3,["Possessive","Aggressive"]), Dog("Chihuahua",1,["Loud, Jumpy"])]
sum = 0
for dog in Breeds:
 sum = sum + Dog.age
print("The average age of breeds is: " + str(sum/len(Breeds)))'''
```Traceback (most recent call last):
 File "C:\Users\Hilary\Desktop\hello.py", line 12, in <module>
 Breeds = Breeds = [Dog("Alsation", 2,["Protective","Smart"]), Dog("Rotteweiler", 3,["Possessive","Aggressive"]), Dog("Chihuahua",1,["Loud, Jumpy"])]
TypeError: Dog() takes no arguments
>>> ```

• sinsuren: Dog() takes no arguments This says that Dog Class doesn't accept any arguments.
• sinsuren: Please search how to create objects with parameters in python. Secondly Breeds = [Dog.. This assignment should be only once. You are done assignment twice.
• jonrsharpe: '_init_' != '__init__'
• Hampus Larsson: Not related to your original question, but your loop to sum all the dogs age should be changed from: sum = sum + Dog.age to sum += dog.age. When you call Dog.age you will get an AttributeError because the class Dog doesn't have the attribute age set, the instance of the class has.
• OverLord-in-Beta: @HampusLarsson when I do that it gives a different answer. 0.3333333 instead of 2.0.

Answer 1

The __init__ method requires 2 underscores left and right, you are using 1.

Therefore your init method isn't recognized, and Python doesn't see any constructors that take your number of arguments.