Getting local variable in python

Vinothkumar

Hi,

I am trying to create a python script which will bring local variable defined in the project. Then I want to update that local variable in runtime automatically.

So for that i tried to use get_variable() function but facing the below error.Is it due to permission problem or anything else?

Would like answer on the below points:

1.Need to get the local variable which is defined.

2.How to update the local variable again in the python script? If you could share some sample code, that would help me

project = client.get_project("MYPROJECT")
variables = project.get_variables()

Error:

DataikuExceptionTraceback (most recent call last)
<ipython-input-36-2b18e5e67dd1> in <module>()
----> 1 variables = project.get_variables()

/app/dataiku/dataiku-dss-8.0.2/python/dataikuapi/dss/project.pyc in get_variables(self)
    801         """
    802         return self.client._perform_json(
--> 803             "GET", "/projects/%s/variables/" % self.project_key)    804 
    805     def set_variables(self, obj):

/app/dataiku/dataiku-dss-8.0.2/python/dataikuapi/dssclient.pyc in _perform_json(self, method, path, params, body, files, raw_body)
   1010 
   1011     def _perform_json(self, method, path, params=None, body=None,files=None, raw_body=None):
-> 1012         return self._perform_http(method, path,  params=params, body=body, files=files, stream=False, raw_body=raw_body).json()
   1013 
   1014     def _perform_raw(self, method, path, params=None, body=None,files=None, raw_body=None):

/app/dataiku/dataiku-dss-8.0.2/python/dataikuapi/dssclient.pyc in _perform_http(self, method, path, params, body, stream, files, raw_body)
   1001             except ValueError:
   1002                 ex = {"message": http_res.text}
-> 1003             raise DataikuException("%s: %s" % (ex.get("errorType", "Unknown error"), ex.get("message", "No message")))
   1004 
   1005     def _perform_empty(self, method, path, params=None, body=None, files = None, raw_body=None):

DataikuException: com.dataiku.dip.exceptions.UnauthorizedException: Failed to read project permissions

Thanks,

Vinothkumar M

Marlan

Hi @Vinothkumar
,

I can help with an example script for setting a variable from Python:

https://community.dataiku.com/t5/Using-Dataiku-DSS/Set-a-project-level-variable-from-a-python-recipe/m-p/4538#M3119

Marlan

Vinothkumar

Thanks Marlan. Worked perfectly.

Just few follow up question reg the same topic.

When I should use Local and global variable?

Ex:In every run, i have to find a path from the file and use that in the next flow to access files in that path.

So in this case, which variable i should use?

As of now i defined global variable and it worked as expected.

Marlan

Hi @Vinothkumar
,

Glad to hear it worked. Re global vs local variables, I assume you are referring to the variable definition screen. I only use local variables if I'm going to deploy a project to an automation instance of DSS and I want to override a global variable during development.

For example, I sometimes use a variable for the list of addresses to send an error email to (via the Scenario reporter functionality). In Global variables (on the Design instance) I set that to the list of people I will want to send errors once the project is deployed to the automation instance. However, I also set a local variable (of the same name) to just me. This overrides the global variable so only I get the emails during development. Once the project is deployed to automation the global variable is used (since it's not overridden there) and emails are sent to the broader list.

Hope that helps.

Marlan

Vinothkumar

Thanks Marlan.Got the purpose of these 2 variable. Will use accordingly