DevNet Associate DEVASC 200-901 Official Certification Guide by Adrian Iliesiu (z-lib.org)

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Ran 2 tests in 0.001s

FAILED (failures=1)

The first check is still good, so you see one dot at the top,
but next to it is a big F for fail. You get a message saying
that the test_value function is where it failed, and see
that your original function did not catch this error. This
means that the code is giving bad results. A radius of -1 is
not possible, but the function gives you the following
output:

>>> area_of_circle(-1)

3.141592653589793

To fix this, you go back to your original function and
some error-checking code. You use a simple if statement
to check for a negative number, and you raise a
ValueError with a message to the user about invalid
input:

Click here to view code image

from math import pi

def area_of_circle(r):

if r < 0:

raise ValueError('Negative radius value

error')

return pi*(r**2)

Now when you try the test from the interpreter, you see
an error raised:

Click here to view code image