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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

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
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 ?
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?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
what is system testing
what is the application of nanotechnology?
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
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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