When passed by class, numbers do not come out random

Question

I’m creating a neural network, and now I’m doing the part that would create the population to be trained, but I’m not getting a randomness. I just don’t understand it and I don’t know how to get around it. (except for the possibility that a function outside the class would be passed to modify the values)

the following code exemplifies the error:

import random as rd

# Criar 10 numeros aleatorios

# 10 random normal
for i in range(10):
  test = rd.randrange(-1000, 1000)
  print(test)

# 10 random por class
class NeuralNetwork:
  random = rd.randrange(-1000, 1000)

for n in range(10):
  test = NeuralNetwork()
  print(test.random)

I did it in repl.it https://repl.it/@nazesaria/Acrobaticimpurebinarysearchtree#main.py

How can I get around it otherwise?

Answer 1

This behavior occurs because you have defined a class variable random as the value returned by rd.randrange(-1000, 1000) that this value will be the same for all instances and how only one call is made rd.randrange(-1000, 1000) when defining the class NeuralNetwork he remains the same.

A solution if its intention is to generate a different value at each reading of random would create a reading property random with the help of the developer @Property and make each reading return the value of rd.randrange(-1000, 1000):

import random as rd

class NeuralNetwork:
  
  @property
  def random(self):
      return rd.randrange(-1000, 1000)

test = NeuralNetwork()

for n in range(10):      
  print(test.random)