input: Write a python function to parse a JSON string into a Python dictionary.
  assert parse_json('{"name": "John Doe","age": 33,"hobbies": ["cooking","travel","reading"]}') == {'name': 'John Doe', 'age': 33, 'hobbies': ['cooking', 'travel', 'reading']}
  assert parse_json('{"city": "New York","population": 8419000}') == {'city': 'New York', 'population': 8419000}
  assert parse_json('{"success": true, "value": 100}') == {'success': True, 'value': 100}
output: import json
  
  def parse_json(json_string):
      return json.loads(json_string)