What do you mean python doesn’t have good tools to select what you need from a dictionary and keep the original intact, you just use a dictionary comprehension and boom you’re done...

  new_dictionary = {__k: __v for __k, __v in original_dictionary.items() if __k not in {‘key1’, ‘key2’, ‘key3’}}

(written on my phone without a repl to double check but the technique is sound and i use it all the time)