input: Write a python function to parse a JSON string and convert it to a Python dictionary.
  assert parseJSON('{"name": "John", "age": 30, "city": "New York"}') == {"name": "John", "age": 30, "city": "New York"}
  assert parseJSON('{"a": 1, "b": 2, "c": 3}') == {"a": 1, "b": 2, "c": 3}
  assert parseJSON('{}') == {}
output: import json
  
  def parseJSON(json_string):
      return json.loads(json_string)