<< Chapter < Page Chapter >> Page >

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

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Itse 1359 introduction to scripting languages: python' conversation and receive update notifications?