Mutable or immutable?

The following function adds a mapping between a string and the lowercase version of that string to a dictionary. What do you expect the values of d and s to be after the function is called?

def store_lower(_dict, _string):
  """Add a mapping between `_string` and a lowercased version of `_string` to `_dict`

    _dict (dict): The dictionary to update.
    _string (str): The string to add.
  orig_string = _string
  _string = _string.lower()
  _dict[orig_string] = _string

d = {}
s = 'Hello'

store_lower(d, s)
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