[Python] How is value initialized in this line of Python ocde?

I am trying to refactor some code(for deploying on a new infrastructure).

Quite a big class

class GithubOrganization(dict):
def __init(self,organization_dict,rest_session):
self.rest_session=rest_session
super(GithubOrganization,self)__init(self,organization_dict)


and this is the line of the code that I do not understand

self.github_organization:GithubOrganization=self.github_session.organizations.get_org(self.login)


where login and github_session were initialized before. what does

self.github_organization:GithubOrganization


serve for?

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