Почему Python не изменяет переменные в цикле?

from random import uniform

data = [
    [1, 0, 0], [0, 1, 0], [0, 0, 1], [0, 0, 1],
    [0, 1, 0], [1, 0, 0], [1, 0, 0], [0, 1, 0],
    [0, 0, 1], [0, 0, 1], [0, 1, 0], [1, 0, 0]
]
response = [0, 1, 2, 2, 1, 0, 0, 1, 2, 2, 1, 0]

hardlim = lambda s: 1 if s >= 0 else 0

def net(x: list, w: list, bias: float) -> float:
    return sum(w[i] * x[i] for i in range(len(x))) + bias

def train_perceptron(data: list, target: list, epochs: int = 10, lr: float = 0.1):
    w = [uniform(-1, 1) for _ in range(3)]  
    bias = 0.0
    for _ in range(epochs):
        for i in range(len(data)):
            res = hardlim(net(data[i], w, bias))
            err = target[i] - res
            w = [w[j] + (lr * err * data[i][j]) for j in range(len(w))]
            bias += lr * err
    return w, bias

perceptrons = []
for class_label in [0, 1, 2]:   
    binary_target = [1 if y == class_label else 0 for y in response]
    w, bias = train_perceptron(data, binary_target, epochs=10, lr=0.1)
    perceptrons.append((w, bias))

print("Trained perceptrons:")
for i, (w, bias) in enumerate(perceptrons):
    print(f"Class {i}: Weights = {w}, Bias = {bias}")