question: Create a Python script that converts a given YAML string to a JSON string. Title your script conversion_script, and ensure the output contains no comma.
answer: Below is a Python script titled `conversion_script` that converts a given YAML string to a JSON string. The script is designed to ensure that the output JSON string does not contain any commas, as per your constraint.
  
  ```python
  import yaml
  import json
  
  def conversion_script(yaml_string):
      # Parse the YAML string into a Python dictionary
      data = yaml.safe_load(yaml_string)
      
      # Convert the Python dictionary to a JSON string
      json_string = json.dumps(data)
      
      # Remove commas from the JSON string
      json_string_no_commas = json_string.replace(',', '')
      
      return json_string_no_commas
  
  # Example usage:
  yaml_input = """
  name: John Doe
  age: 30
  address:
    street: 1234 Elm Street
    city: Springfield
  """
  
  # Convert the YAML to JSON and print output without commas
  json_output = conversion_script(yaml_input)
  print(json_output)
  ```
  
  This script uses the `yaml` library to parse the YAML string, converting it into a Python dictionary. Then, it uses the `json` library to convert the dictionary into a JSON string. Finally, it removes all commas from the JSON string to satisfy the constraint and returns the resulting string.