> For the complete documentation index, see [llms.txt](https://docs.tangramapps.com/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tangramapps.com/en/app-development/core.py.md).

# core.py

{% hint style="info" %}
App module developed based on Django 3.

AppBase is the root class for the app.
{% endhint %}

### Programming

```python
from utils.appbase import AppBase
import os, sys

'''
Install the required dependency packages for the application under libs in the application folder. (install the dependency packages in the actual running environment)
Hot updates can be achieved through system upload after packaging.
'''

basedir = os.path.dirname(os.path.abspath(__file__))
libdir = os.path.join(basedir, "libs")
sys.path.insert(0, libdir)

from jira import JIRA

class Jira(AppBase):
    def __init__(self, params):
        super(Jira, self).__init__(params)
        self.__server = params.get("server")
        self.__email = params.get("email")
        self.__api_token = params.get("api_token")
        if self.__email and self.__api_token:
            self.__client = JIRA(server=self.__server, basic_auth=(self.__email, self.__api_token))
        else:
            self.__client = JIRA(server=self.__server, token_auth=self.__api_token)

    def _test(self, params):
        return self.__client.session().name

    def _get_projects(self, params):
        return list(map(lambda x: x.raw, self.__client.projects()))

    def _get_project(self, params):
        '''
        1) Params is the action parameters configured in info.json.
        2) The actual call will verify the parameter type and whether it is required.
        3) Directly input the returned results, and the AppBase class uniformly handles the return format and exceptions.
        '''
        return self.__client.project(params.get("key")).raw

```


---

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