Function to determine if two numbers are nearly equal when rounded to n significant decimal digits

Question

I have been asked to test a library provided by a 3rd party. The library is known to be accurate to n significant figures. Any less-significant errors can safely be

Answer 1

I have been asked to test a library provided by a 3rd party

If you are using the default Python unittest framework, you can use assertAlmostEqual

self.assertAlmostEqual(a, b, places=5)