Let's say you have an dictionary (key:value pairs) of food. Here is how you can loop through the dictionary.

#!/usr/bin/python3
dictionary = {
  "fruit":"apple",
  "veggy":"tomato",
  "grain":"rice"
}

for key in dictionary:
  print(f"{key} = {dictionary[key]}")

The following should be returned.

fruit = apple
grain = rice
veggy = tomato

And let's say you have a nested dictionary.

#!/usr/bin/python3
dictionary = {
  "food":{
    "fruit":"apple",
    "veggy":"tomato",
    "grain":"rice"
  }
}

for key in dictionary:
  print(f"key = {key}")
  for item in dictionary[key]:
    print(f"{item} = {dictionary[key][item]}")

Or like this.

#!/usr/bin/python3
dictionary = {
  "food":{
    "fruit":"apple",
    "veggy":"tomato",
    "grain":"rice"
  }
}

for item in dictionary['food']:
  print(f"{item} = {dictionary['food'][item]}")

The following should be returned.

key = food
fruit = apple
grain = rice
veggy = tomato