[WEBAPP] How to run a scenario with a local variable

Redouxne

I have a python recipe in my scenario working with a local variable.

I have succesfully executed my scenario within the webapp but :

How can I change the local variable from the webapp's code (in the Python back-end) ?

Sarina

Hi @Redouxne
,

Are you using a scenario variable or a project variable? Indeed, for scenario variables, it's only possible to set them from within the context of a scenario.

So, if you want to set a variable that will be used in a scenario but set it from a Webapp, you'll probably want to use a project variable instead. You can see the following code example for how to set a variable from the Python API, which can be run in the Python backend.

import dataiku 
client = dataiku.api_client()
project = client.get_default_project()

variables = project.get_variables()
variables['standard']['some_variable'] = 'some_value'    
project.set_variables(variables)

Then, from your scenario you can obtain this variable in a Python step:

import dataiku 
client = dataiku.api_client()
project = client.get_default_project()

variables = project.get_variables()
some_variable_value = variables['standard']['some_variable']

Let me know if this approach doesn't work for you!

Thank you,
Sarina

Redouxne

Hi Sarina,

Thank you ! At first glance it seems to work, I have another question, do you know how to know when the scenario ended and get the information in my Python back-end ?

Thank you again,

Redouane

Turribeach

Please raise a new thread as this is a different question and this thread has been marked as resolved already.

sichoudh

Sarina

Jan 12, 2024

Hi @Redouxne
,

Are you using a scenario variable or a project variable? Indeed, for scenario variables, it's only possible to set them from within the context of a scenario.

So, if you want to set a variable that will be used in a scenario but set it from a Webapp, you'll probably want to use a project variable instead. You can see the following code example for how to set a variable from the Python API, which can be run in the Python backend.

import dataiku 
client = dataiku.api_client()
project = client.get_default_project()

variables = project.get_variables()
variables['standard']['some_variable'] = 'some_value'    
project.set_variables(variables)

Then, from your scenario you can obtain this variable in a Python step:

import dataiku 
client = dataiku.api_client()
project = client.get_default_project()

variables = project.get_variables()
some_variable_value = variables['standard']['some_variable']

Let me know if this approach doesn't work for you!

Thank you,
Sarina

Why are u using -

variables['standard']['some_variable'] = 'some_value'  

If my Json structure is simple, Can I use :

variables['some_variable'] = 'some_value'  

Even after this if I again print project.get_variables(), it doesnot print any value in my dash webapp

variables = project.get_variables()
variables['standard']['some_variable'] = 'some_value'    
project.set_variables(variables)
variables = project.get_variables() #doesnot get any value

Any help is highly appreciated

Turribeach

sichoudh

Mar 28, 2025

https://community.dataiku.com/discussion/comment/40038#Comment_40038

Why are u using -

variables['standard']['some_variable'] = 'some_value'  

If my Json structure is simple, Can I use :

variables['some_variable'] = 'some_value'  

Even after this if I again print project.get_variables(), it doesnot print any value in my dash webapp

variables = project.get_variables()
variables['standard']['some_variable'] = 'some_value'    
project.set_variables(variables)
variables = project.get_variables() #doesnot get any value

Any help is highly appreciated

@sichoudh This thread is already been answered and over a year. Please start a new thread with your question.