input: from typing import List
  
  def print_customer_data(name: str):
      """ Code for searching customer data by customer name and 
      printing results 
      >>> print_customer_data('Alice')
      Name: Alice, ID: 101, Balance: $500
      >>> print_customer_data('Bob')
      Name: Bob, ID: 102, Balance: $750
      >>> print_customer_data('Charlie')
      Name: Charlie, ID: 103, Balance: $300
      """
      ...
  
  # 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 = {
          'Alice': {'ID': 101, 'Balance': 500},
          'Bob': {'ID': 102, 'Balance': 750},
          'Charlie': {'ID': 103, 'Balance': 300}
      }
      
      if name in customer_data:
          customer = customer_data[name]
          print(f"Name: {name}, ID: {customer['ID']}, Balance: ${customer['Balance']}")
      else:
          print(f"Customer {name} not found.")