students = [ #array/list
    {'first_name': 'Michael', 'last_name' : 'Jordan'}, #object
    {'first_name': 'John', 'last_name' : 'Rosales'},
    {'first_name': 'Mark', 'last_name' : 'Guilen'},
    {'first_name': 'KB', 'last_name' : 'Tonel'},
]
for i in range (0, len(students)):
    print "{} {}".format(students[i]["first_name"], students[i]['last_name'])

users = {
    'Students': [
        {'first_name': 'Michael', 'last_name' : 'Jordan'}, #object
        {'first_name': 'John', 'last_name' : 'Rosales'},
        {'first_name': 'Mark', 'last_name' : 'Guilen'},
        {'first_name': 'KB', 'last_name' : 'Tonel'},
    ],
    'Instructors': [
        {'first_name' : 'Michael', 'last_name' : 'Choi'},
        {'first_name' : 'Martin' , 'last_name' : 'Puryer'}
    ]
}

for group in users:
    print group
    print users[group]
    group_of_users = users[group]
    for i in range (0, len(group_of_users)):
        full_name = group_of_users[i]["first_name"] + group_of_users [i] ["last_name"]
        print "{} - {} {} - {}".format(i+1, group_of_users[i]["first_name"], group_of_users[i]['last_name'], len(full_name))