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 application should take a customer name as a command-line argument and print the corresponding customer data if found. If no customer name is provided or more than one argument is given, the application should return an error message. 
  
  assert print_customer_data("John")==None
  assert print_customer_data("Jane")==None
  assert print_customer_data("Alice")==None
  assert print_customer_data("Bob")==None
output: def print_customer_data(name):
      customers = {"John": "Data for John", "Jane": "Data for Jane", "Alice": "Data for Alice", "Bob": "Data for Bob"}
      if name in customers:
          print(customers[name])
      else:
          print("Customer not found")