Let's say you have the following dictionary that contains key value pairs.

Here is how you can remove a key (and it's child keys and values) from a dictionary using del.

#!/usr/bin/python3
dictionary = {
  'domains': {
    'foo.example.com': {
      'alias': 'foo',
      'region': 'us-east-1'}, 
    'bar.example.com': {
      'alias': 'bar',
      'region': 'us-east-1'}
    }
}

print (f"before = {dictionary}")
del dictionary['domains']['foo.example.com']
print (f"after = {dictionary}")

Which should return the following.

before = {'domains': {'foo.example.com': {'alias': 'foo', 'region': 'us-east-1'}, 'bar.example.com': {'alias': 'bar', 'region': 'us-east-1'}}}
after  = {'domains': {'bar.example.com': {'alias': 'bar', 'region': 'us-east-1'}}}

Let's say you have a list that contains two (or more) dictionaries. Here is how you can remove specific dictionaries.

my_list = [ {"name": "john.doe", "department": "it"}, {"name": "jane.doe", "department": "sales"}, {"name": "jack.doe", "department": "hr"} ]

print("")
print("BEFORE")

indexes_to_remove = []

for index in range(len(my_list)):
  print(f"index {index}: {my_list[index]}")
  if my_list[index]['name'] == "jane.doe":
    indexes_to_remove.append(index)

for index in indexes_to_remove:
  print(f"index to remove = {index}")
  del my_list[index]

print("")
print("AFTER")

for index in range(len(my_list)):
  print(f"index {index}: {my_list[index]}")

Which should return the following.

BEFORE
index 0: {'name': 'john.doe', 'department': 'it'}
index 1: {'name': 'jane.doe', 'department': 'sales'}
index 2: {'name': 'jack.doe', 'department': 'hr'}
index to remove = 1

AFTER
index 0: {'name': 'john.doe', 'department': 'it'}
index 1: {'name': 'jack.doe', 'department': 'hr'}