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pythondictionarylist-comprehension

How to check if a set of keys have the same value?

Let's say we have a dict

dict = {
  "a": "x",
  "b": "x",
  "c": "x",
  "d": "y",
  "e": "y",
  "f": "y",
}

How do I quickly check, if a set of specific keys all have the same value?

E.g.:

list_of_keys = ["a", "b", "c"]

should return True.

list_of_keys = ["b", "c", "d"]

should return False.

Thanks in advance.

Solution

  • You can use built-in all function and compare all values to the first one:

    all(dict[k] == dict[list_of_keys[0]] for k in list_of_keys)

    Another suggestion (from the comments):

    len(set(dict[k] for k in list_of_keys)) == 1

    Sidenote: don't use dict as a variable name. It's python's built-in.