I have the same problem... this task seems to me unclear because nothing works. I completed the easier one and I though this is in the same manner but it is senseless to guess what to do

I don't get it at all. I defined __ and __ and __ or __ methods in Specification class and in test cases I keep getting the following error:
TypeError: unsupported operand type(s) for &: 'type' and 'type'.
I though that Water and Hot classes inherit from Specification class... Any hint?

thanks! it helped

I passed all of the test cases, but when I push attempt button I got:

"Traceback (most recent call last):
File "main.py", line 4, in
import codewars_test as test
ModuleNotFoundError: No module named 'codewars_test'"

what is it about?

I passed all the test cases but I'm stuck at random test. I have to following error:

Traceback (most recent call last):
File "/workspace/default/src/codewars-test/codewars_test/test_framework.py", line 111, in wrapper
func()
File "tests.py", line 108, in it_1
template(b, n, l)
File "tests.py", line 95, in template
test.expect(all(getattr(user, x) == getattr(result, x) for x in value_names), "Expected: {}\nReceived: {}".format(result, user), allow_raise=True)
File "/workspace/default/src/codewars-test/codewars_test/test_framework.py", line 24, in expect
raise AssertException(message)
codewars_test.test_framework.AssertException: Expected: <main.random_tests..template..B object at 0x7fae26dbba30>
Received: Ofrsngx(14, 10, 17)

I cannot figure this out. Could anybody give me a hint?

Now I've found the kata that concerns the Euler's method. I've been planning to create the whole series about solving systems of differential equations and I wanted to start off with something easy. Maybe I will transform the task into the system of two equations or, as rge123 suggested, I will enforce improved Euler's method.

Answering dolamroth suggestions:

1. I don't quite follow, I need to think this through
2. I will change the task to be more specific

Now I am aware that I should disable some functions but I can not figure it out. How to block a function? I know it may be a silly question but I've been trying to find this out and no success.

I fixed that. Now the last value from the input data will be always greater than 0.1

Thanks, it was by accident. I fixed this issue.

Could anyone give me a hint? I understand what it is about and everything works fine except time out issue. I have no idea how to sort this out. I am using gradient descent to find two line coefficients and loss function is a mean squared difference between approximated solution and given y values (so it is MSE I think), what should I change?

Thanks for that remark!
As you can see I am not a master of regex :D