What operations can be performed with keys in a Python dictionary?

In Python, dictionary keys can be used to perform the following operations:

• Check for key existence:

  if key in my_dict:
      print("Key exists")
  

• Get value by key:

  value = my_dict[key]
  # or safely
  value = my_dict.get(key, default_value)
  

• Add or update key-value pair:

  my_dict[key] = value
  

• Delete a key:

  del my_dict[key]
  # or
  my_dict.pop(key, default_value)
  

• Iterate over keys:

  for key in my_dict.keys():
      print(key)
  

• Get all keys as a list:

  keys_list = list(my_dict.keys())
  

• Copy dictionary:

  new_dict = my_dict.copy()
  

Keys in a dictionary must be immutable types (e.g., strings, numbers, tuples).