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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

Do somebody tell me a best nano engineering book for beginners?
s. Reply
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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.
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Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
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good afternoon madam
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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
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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.
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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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