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Figure 3 . Floating point errors.
>>>10/3 + 20/3 10.0

However, in this case, Python returned an answer of 10.0, indicating that the answer is accurate to three significant figures. This is not really thecorrect answer, but as a practical matter, it may be the best answer. I will leave that for you to decide.

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Answer 10

Probably not. Floating point arithmetic often suffers from speed penalties. In addition, integer arithmetic produces exact results while floating pointarithmetic usually produces approximate results (although the approximations may be very close to being exact in many cases) .

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Answer 9

Floating point usually provides the greater range for storage of numeric values.

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Answer 8

The assignment operator causes the value of its right operand to be stored in the memory location identified by its left operand.

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Answer 7

An example of such a program is shown in Figure 1 . Note that the names of the two variables have the same letters, but different case.The fact that the two variables are different variables is illustrated by the fact that each is assigned a different value. The sum of the two variablesdemonstrates that the two variables contain different, and correct, values.

Figure 1 . Same letters, different case.
>>>aX=10 # this is one variable>>>Ax=20 # this is a different variable>>>aX+Ax 30>>>

Contrast the above result with the program in Figure 2 where a variable whose name contains the same letters and the same case isused twice.

Figure 2 . Same letters, same case.
>>>ax=10>>>ax=20>>>ax+ax 40>>>

All the program in Figure 2 accomplishes is the assignment of two different values to the same variable. The secondassignment overwrites the value previously assigned to the variable. The program then adds thevariable to itself using its current value of 20 producing a result of 40 (instead of 30 as in the previous example) .

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Answer 6

False. Variable names must begin with a letter or underscore character.

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Answer 5

Use meaningful variable names for which the spelling is obvious, such as theOverheadRate .

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Answer 4

Several different kinds of problems can result from making typing errors that result in misspelling the names of variables. These errors usually result inprograms that produce incorrect results without warning.

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Answer 3

False. Variable declarations are not required in Python. All that is required to cause a variable to come into existence is to invent a new name fora variable and assign a value to it.

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Answer 2

False. Python is not a strongly typed language. From a pure technical viewpoint, the Python programmer rarely needs to be concerned about type.

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Answer 1

False. The value of a variable is intended to change during the execution of the program. The value of a constant (which I haven't discussed so far in this collection) is not intended to change.

Go back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Itse1359-1030r-Review
  • File: Itse1359-1030r.htm
  • Published: 10/14/14
  • Revised: 20/20/15
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 possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not 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

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
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
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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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