Merge branch 'feat-add-docstring-in-task' into 'fix-linting'

Feat add docstring in task

See merge request louistw/self-reg-form!4

tasks.py

+    """
+    This python module defines celery tasks for following fucntions:
+        * Account creation
+        * Account certification
+    """
 # standard imports
 import json
 import sys
@@ -22,7 +27,24 @@ timeout = 30
 
 
 def gen_f(room):
+    """
+    This function defines the callback function for creating account process.
+    Inputs:
+        room: Room/session ID for the flask session, so that communications are going to the right session.
+    Output: 
+        RabbitMQ callback function.
+    """
     def callback(channel, method, properties, body):
+        """
+        This function defines the RabbitMQ callback function executed after account creation process.
+        Inputs:
+            channel: channel over which the RabbitMQ communication is happening.
+            method: Defines meta information regarding the message delivery.
+            properties: user-defined properties on the message
+            body: Message that is passed throughout account creation process across multiple agents.
+        Output:
+            Send appropriate message to the frontend, for account creation success or failure. And delete the queue.
+        """
         msg = json.loads(body)
         username = msg["username"]
         queuename = msg["queuename"]
@@ -44,7 +66,24 @@ def gen_f(room):
 
 
 def certify_gen_f(room):
+    """
+    This function defines the callback function for certifying account process.
+    Inputs:
+        room: Room/session ID for the flask session, so that communications are going to the right session.
+    Output: 
+        RabbitMQ callback function.
+    """
     def callback(channel, method, properties, body):
+        """
+        This function defines the RabbitMQ callback function executed after account certification process.
+        Inputs:
+            channel: channel over which the RabbitMQ communication is happening.
+            method: Defines meta information regarding the message delivery.
+            properties: user-defined properties on the message
+            body: Message that is passed throughout account creation process across multiple agents.
+        Output:
+            Send appropriate message to the frontend, for account certification success or failure. And delete the queue.
+        """
         msg = json.loads(body)
         username = msg["username"]
         queuename = msg["queuename"]