input: Write a function to create a command-line application in Python that stores customer data and allows customers to query by customer name. The function should have a main function that accepts customer names as command-line arguments and prints the customer data if found. If the arguments are invalid, it should print an error message.
  
  def print_customer_data(name): 
      # 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.")
  
  assert print_customer_data("John Doe") == None
  assert print_customer_data("Jane Smith") == None
  assert print_customer_data("") == None
  assert print_customer_data(None) == None
  assert __name__ == "__main__"
output: def print_customer_data(name): 
      customers = {"John Doe": "123 Main St, Anytown, USA", "Jane Smith": "456 Elm St, Othertown, USA"}
      if name in customers:
          print(customers[name])
      else:
          print("Customer not found.")