Time for action – asserting approximately equal

Let's take the numbers from the previous Time for action section and let the assert_approx_equal() function work on them:

  1. Call the function with low significance:
    print("Significance 8", np.testing.assert_approx_equal (0.123456789, 0.123456780,significant=8))

    The result is as follows:

    Significance 8 None
  2. Call the function with high significance:
    print("Significance 9", np.testing.assert_approx_equal (0.123456789, 0.123456780, significant=9))

    The function raises an AssertionError:

    Significance 9
Traceback (most recent call last):
  ...
    raise AssertionError(msg)
AssertionError:
Items are not equal to 9 significant digits:
 ACTUAL: 0.123456789
 DESIRED: 0.12345678

What just happened?

We used the assert_approx_equal() function from the NumPy testing package to check whether 0.123456789 and 0.123456780 are equal for different decimal precisions.

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