It works now

example.env.py

@@ -1,4 +1,8 @@
+if __name__ == '__main__':
+    print("This is not a script!")
+    exit()
+
 UPTIME_KUMA_ADMIN_USER='admin'
-UPTIME_KUMA_ADMIN_PASSWORD='admin'
+UPTIME_KUMA_ADMIN_PASSWORD='admin123'
 UPTIME_KUMA_URL='https://status.example.com'
-UPTIME_KUMA_OUT='/path/to/file.html'
+UPTIME_KUMA_OUT='/path/to/file.html'

uptime-kuma-homepage.py

@@ -1,5 +1,6 @@
 #! /bin/python3
-import json,env
+import json
+from env import *
 from uptime_kuma_api import UptimeKumaApi, MonitorType
 
 descriptions = {