I have a problem with my neural network code

Question

Hi everyone! Help me please. I tried to write a neural network code without keras, tensorflow and pandas, only with numpy and matplotlib, but always I have the same error in each epoch.
Here the code
https://code.sololearn.com/cmJ7A6WDrFIH/?ref=app

Answer 1

Update the weights

Answer 2

Take a closer look, because I don't think it's happening

Answer 3

Wow, thanks Steve, it's true. I just changed
for (w,dw) in zip(self.w,dW):
w = w + dw
to
for (w,dw) in zip(self.w,dW):
w += dw

Answer 4

I'm glad it helped!

Answer 5

What are lines 89 and 90 supposed to accomplish?