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Figure index

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Answer 15

False. The output is shown in Figure 8 . The keys and the values were switched in the bottom panel of Figure 7 .

Figure 8 . Answer 15.
Get and display values b'Joe'b'39' b'333.444.5555'b'married' b'639'b'male' Get and display keysb'name' b'age'b'phone' b'marital'b'cubicle' b'gender'Attempt to pop and display two values b'333.444.5555'no weight Get and display keys and valuesDatabase length 5 (b'name', b'Joe')(b'age', b'39') (b'marital', b'married')(b'cubicle', b'639') (b'gender', b'male')Delete a key/value pair and display again Database length 4(b'name', b'Joe') (b'age', b'39')(b'marital', b'married') (b'gender', b'male')

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Answer 14


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Answer 13

False. The output is shown in Figure 5 . The in operator searches for a match in the keys and does not search for a match in the values .

Figure 5 . Answer 13.
Not in dumbDb

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Answer 12


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Answer 11

False. The code in Figure 1 produces an error by attempting to store a number as a value. The output (with some text deleted for brevity) is shown in Figure 2 .

Figure 2 . Answer 11.
Traceback (most recent call last): File "1359-1930-11.py", line 11, in<module>dumbDb[b'aNumber'] = 1234... raise TypeError("values must be bytes or strings")TypeError: values must be bytes or strings

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Answer 10

True. See The Python Standard Library - 12.5. dbm - Interfaces to Unix "databases" .

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Answer 9

True as of 11/09/2014.

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Answer 8

True. See comments in sample code at The Python Standard Library - 12.5. dbm - Interfaces to Unix "databases" .

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Answer 7

False. The object returned by dbm.open supports the same basic functionality as dictionaries . Keys and their corresponding values can be stored, retrieved, and deleted. The in operator and the keys method are available, as well as get and setdefault .

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Answer 6

False. The function named dbm.open can be called to open an existing dbm database file or to create a new dbm database file.

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Answer 5


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Answer 4

False. dbm is a generic interface to variants of the DBM databases - dbm.gnu or dbm.ndbm . If neither of these modules is installed, the slow-but-simple implementation in module dbm.dumb will be used.

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Answer 3

False. As of 11/09/2014, no such warning appears on the referenced webpage. Therefore, it might be concluded that even though shelve has features that are not available in dbm , dbm is the more secure of the two. As a result, this course will concentrate on dbm and ignore shelve .

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Answer 2

True as of 11/09/2014.

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Answer 1

True as of 11/09/2014.

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This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Itse1359-1930-Dbm and Shelve Databases
  • File: Itse1359-1930.htm
  • Published: 11/10/14
  • Revised: 07/28/16

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possiblefor you to purchase a pre-printed version of the PDF file, you should be aware that some of the HTML elements in this module maynot translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.


Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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