Time for action – asserting approximately equal

Let's take the numbers from the previous Time for action tutorial 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:

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

    An exception is thrown:

    Significance 9
Traceback (most recent call last):
  ...
raiseAssertionError(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 precision.

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