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Figure 2 shows that the test failed because the result of the computation did not match the specified value of 6. In this case, the output from thecomputation was correct but the value specified by the test was incorrect.

When testing using the doctest module, you specify what the result must be for the test to pass.If the test fails to produce a matching result, the output will show that the test failed. For the case of Listing 1 and Listing 2 , if the correct result had been specified, the test would simply have returned to the commandprompt with no other output.

A verbose output could have been specified in Listing 2 to cause the test to return positive results even if there were no failures. You will see howto do that in the next example.

A more substantive example

The module named Py1359_1720_02

This example will perform a test on a simple function named sum in a module named Py1359_1720_02.py as shown in Listing 3 .

Listing 3 . Contents of the file named Py1359_1720_02.py.
def sum(parA,parB): return parA + parB

The test file named Py1359_1720_02

The test file for this example is shown in Listing 4 .

Listing 4 . Contents of the test file named Py1359_1720_02.txt.
>>>from Py1359_1720_02 import sum>>>sum(2,3) 6

This file will actually cause two tests to be performed. The first test is to import the function named sum from the module named Py1359_1720_02 . However, no visible output is expected from this test. Therefore, no output is specified in Listing 4 .

The second test is to call the function named sum (shown in Listing 3 ) passing 2 and 3 as parameters. The test file shows that an incorrect output value of 6 is expected from this test. (As before, an incorrect value was specified to force the test to fail for illustration purposes only.)

The batch file named Py1359_1720_02

The batch file used to execute the test is shown in Listing 5 .

Listing 5 . Contents of the batch filenamed Py1359_1720_02.bat.
echo off rem set the pathpath=%path%;"C:\Program Files (x86)\Python34" rem perform the testpython -m doctest -v Py1359_1720_02.txt pause

This batch file differs from the one shown in Listing 2 in one respect. The -v switch following doctest in the command causes the output to be more verbose than the output from the previousexample.

The output

The execution of the third (python) command in Listing 5 produced the command line output shown in Figure 3 .

Figure 3 . Output produced by the test file named Py1359_1720_02.txt.
Trying: from Py1359_1720_02 import sumExpecting nothing okTrying: sum(2,3)Expecting: 6********************************************************************** File "Py1359_1720_02.txt", line 2, in Py1359_1720_02.txtFailed example: sum(2,3)Expected: 6Got: 5********************************************************************** 1 items had failures:1 of 2 in Py1359_1720_02.txt 2 tests in 1 items.1 passed and 1 failed. ***Test Failed*** 1 failures.

As mentioned earlier, this output is more verbose than the output shown in Figure 2 . In this more verbose output, tests that pass are shown in addition totests that fail. For example, the test of the import statement is shown as ok .

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
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what is system testing?
AMJAD
preparation of nanomaterial
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how to synthesize TiO2 nanoparticles by chemical methods
Zubear
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Itse 1359 introduction to scripting languages: python. OpenStax CNX. Jan 22, 2016 Download for free at https://legacy.cnx.org/content/col11713/1.32
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