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Figure index

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Answers

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

True.

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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

True.

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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

True.

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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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Miscellaneous

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
Disclaimers:

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.

-end-

Questions & Answers

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
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
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
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
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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