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

Let's say you have a dictionary that contains two or more nested list. Here is an example of how you could loop through the dictionary.

#!/usr/bin/python3
dictionary = {
  "foo": [
      {
        "bar": [
          { "hello": "world" }
      ]
    }
  ]
}

for index, key in enumerate(dictionary):
  print(f"index = {index}")
  print(f"key = {key}")
  for sub_key in dictionary['foo'][index]:
    print(f"sub_key = {sub_key}")
    for sub_dict in dictionary['foo'][index][sub_key]:
      print(f"sub_dict = {sub_dict}")
      print(f"sub_dict['hello'] = {sub_dict['hello']}")

Running this script should return the following.

index = 0
key = foo
sub_key = bar
sub_dict = {'hello': 'world'}
sub_dict['hello'] = world