input: Write a function that creates a command-line application in Python to store customer data and allows customers to query by customer name. The function should accept command-line arguments for the customer name and then print the relevant customer data if found. If the number of arguments is incorrect, it should print an error message indicating that a customer name must be specified.
  
  import sys 
    
  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("Invalid Name")==None
  assert print_customer_data("")==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("Customer not found.")