input: 
  def print_customer_data(name: str) -> None:
      """Search customer data by customer name and print results.
      >>> print_customer_data('John Doe')
      {'name': 'John Doe', 'age': 30, 'phone': '123-456-7890'}
      >>> print_customer_data('Jane Smith')
      {'name': 'Jane Smith', 'age': 25, 'phone': '987-654-3210'}
      """
      # Code for searching customer data by customer name and 
      # printing results 
      ...
  
  # Main function for the customer search application
  if __name__=="__main__": 
      # Get command line arguments 
      args = sys.argv 
      
      if len(args) == 2: 
          name = args[1]
          print_customer_data(name) 
      else: 
          print("Invalid arguments, please specify a customer name.")
  
output:     customer_data = {
          'John Doe': {'name': 'John Doe', 'age': 30, 'phone': '123-456-7890'},
          'Jane Smith': {'name': 'Jane Smith', 'age': 25, 'phone': '987-654-3210'}
      }
      
      if name in customer_data:
          print(customer_data[name])
      else:
          print(f"No data found for customer: {name}")