Imagine that you have two numbers that are almost equal. Let's use the assert_almost_equal function to check whether they are equal:
Call the function with low precision (up to seven decimal places):
print "Decimal 6", np.testing.assert_almost_equal(0.123456789,0.123456780, decimal=7)
Note that no exception is raised, as you can see in the following result:
Decimal 6 None
Call the function with higher precision (up to eight decimal places):
print "Decimal 7", np.testing.assert_almost_equal(0.123456789, 0.123456780, decimal=8)
The result is:
Decimal 7 Traceback (most recent call last): … raiseAssertionError(msg) AssertionError: Arrays are not almost equal ACTUAL: 0.123456789 DESIRED: 0.12345678
We used the assert_almost_equal function from the NumPy testing package to check whether 0.123456789 and 0.123456780 are equal for different decimal precision.