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 accept a customer name as an argument and print the relevant customer data. If the number of command line arguments is not correct, the function should print an error message. 
  if __name__=="__main__": 
      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
output: def print_customer_data(name):
      customers = {
          "John Doe": "Customer ID: 123, Email: john.doe@example.com",
          "Jane Smith": "Customer ID: 456, Email: jane.smith@example.com"
      }
      if name in customers:
          print(customers[name])
      else:
          print(f"No data found for customer: {name}")