classroom = {
  "person1":{"name":"Effie", "age":10, "school":"st Hellens"},
  "person2":{"name":"Mark", "age": 11, "school":"Merryland"},
  "person3":{"name":"Rachel", "age":13, "school":"Sir Apollo"},
  "person4":{"name":"Collins", "age": 16, "school":"St. Joseph's"}
}

for i in classroom:
  print(i, ":", classroom[i])