diff --git a/data_visualization/data_visualizer.py b/data_visualization/data_visualizer.py
index a4ea0f58f..7bc323636 100644
--- a/data_visualization/data_visualizer.py
+++ b/data_visualization/data_visualizer.py
@@ -1,6 +1,8 @@
 import os
+
 import requests
 
+
 class DataVisualizer:
     def __init__(self, grafana_url, grafana_api_key):
         self.grafana_url = grafana_url
@@ -11,122 +13,103 @@ def create_dashboard(self, dashboard_title, panels):
         Creates a new dashboard in Grafana.
         """
         headers = {
-            'Authorization': f'Bearer {self.grafana_api_key}',
-            'Content-Type': 'application/json'
+            "Authorization": f"Bearer {self.grafana_api_key}",
+            "Content-Type": "application/json",
         }
 
-        url = f'{self.grafana_url}/api/dashboards/db'
-        data = {
-            'dashboard': {
-                'title': dashboard_title,
-                'panels': panels
-            }
-        }
+        url = f"{self.grafana_url}/api/dashboards/db"
+        data = {"dashboard": {"title": dashboard_title, "panels": panels}}
 
         response = requests.post(url, headers=headers, json=data)
 
         if response.status_code != 200:
-            raise Exception(f'Failed to create dashboard: {response.text}')
+            raise Exception(f"Failed to create dashboard: {response.text}")
 
-        return response.json()['dashboard']['uid']
+        return response.json()["dashboard"]["uid"]
 
     def update_dashboard(self, dashboard_uid, panels):
         """
         Updates an existing dashboard in Grafana.
         """
         headers = {
-            'Authorization': f'Bearer {self.grafana_api_key}',
-            'Content-Type': 'application/json'
+            "Authorization": f"Bearer {self.grafana_api_key}",
+            "Content-Type": "application/json",
         }
 
-        url = f'{self.grafana_url}/api/dashboards/uid/{dashboard_uid}'
-        data = {
-            'dashboard': {
-                'panels': panels
-            }
-        }
+        url = f"{self.grafana_url}/api/dashboards/uid/{dashboard_uid}"
+        data = {"dashboard": {"panels": panels}}
 
         response = requests.put(url, headers=headers, json=data)
 
         if response.status_code != 200:
-            raise Exception(f'Failed to update dashboard: {response.text}')
+            raise Exception(f"Failed to update dashboard: {response.text}")
 
-        return response.json()['dashboard']['uid']
+        return response.json()["dashboard"]["uid"]
 
     def delete_dashboard(self, dashboard_uid):
         """
         Deletes a dashboard in Grafana.
         """
-        headers = {
-            'Authorization': f'Bearer {self.grafana_api_key}'
-        }
+        headers = {"Authorization": f"Bearer {self.grafana_api_key}"}
 
-        url = f'{self.grafana_url}/api/dashboards/uid/{dashboard_uid}'
+        url = f"{self.grafana_url}/api/dashboards/uid/{dashboard_uid}"
 
         response = requests.delete(url, headers=headers)
 
         if response.status_code != 200:
-            raise Exception(f'Failed to delete dashboard: {response.text}')
+            raise Exception(f"Failed to delete dashboard: {response.text}")
 
-        return response.json()['message']
+        return response.json()["message"]
 
     def create_panel(self, panel_title, panel_type, panel_json):
         """
         Creates a new panel in Grafana.
         """
         headers = {
-            'Authorization': f'Bearer {self.grafana_api_key}',
-            'Content-Type': 'application/json'
+            "Authorization": f"Bearer {self.grafana_api_key}",
+            "Content-Type": "application/json",
         }
 
-        url = f'{self.grafana_url}/api/panels/database'
-        data = {
-            'title': panel_title,
-            'type': panel_type,
-            'json': panel_json
-        }
+        url = f"{self.grafana_url}/api/panels/database"
+        data = {"title": panel_title, "type": panel_type, "json": panel_json}
 
         response = requests.post(url, headers=headers, json=data)
 
         if response.status_code != 200:
-            raise Exception(f'Failed to create panel: {response.text}')
+            raise Exception(f"Failed to create panel: {response.text}")
 
-        return response.json()['panelId']
+        return response.json()["panelId"]
 
     def update_panel(self, panel_id, panel_json):
         """
         Updates an existing panel in Grafana.
         """
         headers = {
-            'Authorization': f'Bearer {self.grafana_api_key}',
-            'Content-Type': 'application/json'
+            "Authorization": f"Bearer {self.grafana_api_key}",
+            "Content-Type": "application/json",
         }
 
-        url = f'{self.grafana_url}/api/panels/{panel_id}'
-        data = {
-            'json': panel_json
-        }
+        url = f"{self.grafana_url}/api/panels/{panel_id}"
+        data = {"json": panel_json}
 
         response = requests.put(url, headers=headers, json=data)
 
         if response.status_code != 200:
-            raise Exception(f'Failed to update panel: {response.text}')
+            raise Exception(f"Failed to update panel: {response.text}")
 
-        return response.json()['panelId']
+        return response.json()["panelId"]
 
     def delete_panel(self, panel_id):
         """
         Deletes a panel in Grafana.
         """
-        headers = {
-            'Authorization': f'Bearer {self.grafana_api_key}'
-        }
+        headers = {"Authorization": f"Bearer {self.grafana_api_key}"}
 
-        url = f'{self.grafana_url}/api/panels/{panel_id}'
+        url = f"{self.grafana_url}/api/panels/{panel_id}"
 
         response = requests.delete(url, headers=headers)
 
         if response.status_code != 200:
-            raise Exception(f'Failed to delete panel: {response.text}')
+            raise Exception(f"Failed to delete panel: {response.text}")
 
-        return response.json()['message']
+        return response.json()["message"]