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Setting the path with a batch file

Listing 1 shows the contents of a batch file named 1359-1050-01.bat containing four commands that :

  1. Reduce the clutter on the output screen (echo off) .
  2. Temporarily set the path to the location of the file named python.exe on my computer.
  3. Attempt to execute the Python script file named 1359-1050-01.py, which will be discussed later in this module.
  4. Pause onscreen and wait to be dismissed with the prompt "Press any key to continue . . ."
Listing 1 . Setting the path temporarily with a batch file.
echo off path=%path%;"C:\Program Files (x86)\Python34"python 1359-1050-01.py pause

The second command in Listing 1 is the important command for thissection of this module. It will temporarily set the path to the indicated folder. If you elect to use this approach, you will need toreplace the text inside the double quotes with the path to the folder containing the file named python.exe on your computer.

This approach appends the new path onto the environment variable named path on a temporary basis. It goes away as soon as you respond to the pause statement at the end or otherwise close the command-line window that appears when you execute the batch file.

Create a script file

Once you have the path variable properly set, or you know how to set it temporarily in a batch file, use the text editor of your choice andcreate a file named 1359-1050-01.py that contains the Python programming statements shown in Listing 2 . (You can give the file any name that you chooseprovided that the extension is .py and provided that you properly reflect the name in the third line of the batch file shown in Listing 1 .)

Listing 2 . Contents of the file named 1359-1050-01.py.
a=2 b=3a=2*a b=3*bc=a+b print(c)

You should recognize all of the statements in Listing 2 . Note, however, that in a script, they are not preceded by an interactive prompt (>>>).

Store this file in any folder on your hard drive. You may want to create a new directory for the sole purpose of storing Python script files.

Then create the corresponding batch file with the contents shown in Listing 1 and save it in the same folder as the script file. (If you have permanently set your path to support Python, you can omit the path command in Listing 1 .)

Run your script file

Once you have accomplished the above, double-click the batch file to execute it. The batch file will temporarily set the path and attempt to run your script.If all goes well, a command-line window will appear on your screen with contents similar to that shown in Figure 1 . (Note that I deleted some of the text on the first line for brevity. Your first line will be different anyway.)

Figure 1 . Screen output from running the script named 1359-1050-01.py.
M:\Baldwin\AA-School\...>echo off 13Press any key to continue . . .

The correct output

If you go back to the script file in Listing 2 and do the arithmetic, you will see that the output value of 13 produced by the program is correct.

If you got an output value of 13, -- congratulations -- you have just written and executed your first Python script. If not, try to figure out why.

Questions & Answers

Application of nanotechnology in medicine
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
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
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
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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