input: Write a function to create a Python dictionary from a given list of people where the names are keys and the ages are values. If the input list is empty, return an empty dictionary.
  assert create_people_dict("John (20), Jane (40), Alex (18), Peter (45)")=={'John': 20, 'Jane': 40, 'Alex': 18, 'Peter': 45}
  assert create_people_dict("")=={}
output: def create_people_dict(people_str):
      if not people_str:
          return {}
      people_dict = {}
      for person in people_str.split(", "):
          name, age = person.split(" (")
          age = int(age.rstrip(")"))
          people_dict[name] = age
      return people_dict