def almost_equals(a, b):
    diff = abs(a - b)
    is_close = diff < 0.0000001
    return is_close

print("Testing almost_equals...", end="")
assert almost_equals(0.1 + 0.2, 0.3)
assert not almost_equals(100, 10)
assert not almost_equals(10, 100)
print("OK")

def distance(x1, y1, x2, y2):
    k1 = x1 - x2
    k2 = y1 - y2
    h2 = k1 ** 2 + k2 ** 2
    h = h2**0.5
    return h

print("Testing distance...", end="")
expected_value = 5
actual_value = distance(0, 0, 3, 4)
# ca det samme som are_almost_equals = expected_value == actual_value
are_almost_equals = almost_equals(expected_value, actual_value) 
assert are_almost_equals # assert True
print("OK")