What are Loops

for device in devices:
    if interface in device["interfaces"]:
    print(f"ALERT: {device['hostname']} {interface['name']} is down")

Every look begins with for x in y:
- for kicks off the loop process
- X = a variable to temporary hold the data incoming from variable Y.
- Y = a variable, data in a list or dictionary.

list is Y = data []

dictionary is

                Y = [
                    {
                        "hostname": "leaf101", 
                        "interfaces": "eth1/1"
                    }
                ]

Basically the format is --> key:items