input: Write a function to implement a customer data query system via command line in Python. The function should allow users to search for customer data by providing a customer name as a command line argument. If the provided name is valid, it should print the corresponding customer data; otherwise, it should print an error message indicating invalid input. If no arguments are provided, it should print a message indicating that a customer name is required.
  assert main()=="Invalid arguments, please specify a customer name."
  assert main('John Doe')=="Customer data for John Doe: .."
  assert main("")=="Invalid arguments, please specify a customer name."
  assert main('Jane Smith')=="Customer data for Jane Smith: .."
  assert main('')=="Invalid arguments, please specify a customer name."
output: def main(name=None):
      if name is None:
          return "Invalid arguments, please specify a customer name."
      elif name == "":
          return "Invalid arguments, please specify a customer name."
      else:
          return f"Customer data for {name}: .."