Number of attributes in a Python class

Question

Is there any "rule"/convention for the amount of attributes in a class?

Example: In a game, a Character(class) has more than 30 attributes between name, level, strength, etc.

With all the attributes encapsulated the class ends up being gigantic. This is normal or is a bad practice?

Answer 1

The rule is common sense, and mainly, the good programming practices.

To object orientation is a form of programming that enables developers to think about things like work in real life: objects. ²

With techniques such as composition, inheritance and polymorphism, one can achieve a better abstraction:

class Armamento:
   dano = 1
...
class Punhal(Armamento):
    def apunhalar() 
...
class Rifle(Armamento) 
    def atirar()
...
class Agente:
    nivel = 10
    forca = 2
    arma = Rifle
...
class Personagem(Agente): 
    nome = 'ficticio'
    def aguardar_entrada()
...
class Inimigo(Agente):
    def cacular_ataque() 
...

The lack of this abstraction should result in greater effort/operational cost for understanding and maintenance of the code, affecting the software quality.

Even if I exaggerate, I say yes, it is a bad practice a class with more than 30 attributes, with many exceptions. ⁹

Look at object orientation, or necessary for its application, your way.