Pass Parameters to Python Script from Web App?

Question

I have a python file that takes in 6 parameters from the command line and runs.

python_file.py param1, param2, param3, param4, param5, param6

What I would like to do is pass the parameters from a web app using flask with bootstrap. Each parameter needs to have the option from the front end to select what parameter the user chooses. Example of what I am looking for on the front end below is:

Param1_drop_down:  Param2 drop_down:
- option1          - option1 etc..
- option2
- option3
- option4

Any ideas on this? I am new to front end work so any help would be greatly appreciated.

What exactly is your question? Is it how to create a web app with dropdown options? Or do you already have that web app and you wonder how to send data from it to a Flask server that would pass them to your Python file? — Alexander Rossa
– Alexander Rossa, Commented Oct 9, 2019 at 16:13

xhenrique · Accepted Answer · 2019-10-09 16:40:33Z

1

Since you are using the command line to receive the args, I recommend the usage of subprocess.Popen, with that you can run your script in the same way, Popen expects you to run a bash command, you can easily use it to execute your python file with the args chosen by the users.

edit to be more clear: Lets say you have this python script.

from time import sleep
count = 0
while True:
    print("Hello", count)
    count += 1
    sleep(10)

And you want to call it from another script, you can use subprocess.Popen to do this for you.

i.e

import subprocess

process = subprocess.Popen(["python3","yourfile.py"])

#Do something more while the other process is running

You can also redirect the Popen output to a variable and do some work with the return of your code.

edited Oct 9, 2019 at 16:40

answered Oct 9, 2019 at 16:15

xhenrique

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2 Comments

codingInMyBasement Over a year ago

what if I just need the parameters to be passed straight to the python file without using the command line? Is that what you are saying this option does?

xhenrique Over a year ago

I've added more information on my answer. Yes, it will run as a command line, but it will be runned directly from your code, so, you can manipulate which args you want to use.

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