input: from typing import List
  
  
  def print_customer_data(name: str):
      """ Searches for customer data by customer name and prints the results.
      >>> print_customer_data('John Doe')
      Customer Name: John Doe
      Customer ID: 12345
      Contact Number: 555-1234
      >>> print_customer_data('Jane Smith')
      Customer Name: Jane Smith
      Customer ID: 67890
      Contact Number: 555-5678
      """
      ...
  
  # 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.")
output:     customer_data = {
          'John Doe': {
              'Customer ID': '12345',
              'Contact Number': '555-1234'
          },
          'Jane Smith': {
              'Customer ID': '67890',
              'Contact Number': '555-5678'
          }
      }
  
      if name in customer_data:
          print(f"Customer Name: {name}")
          print(f"Customer ID: {customer_data[name]['Customer ID']}")
          print(f"Contact Number: {customer_data[name]['Contact Number']}")
      else:
          print(f"No data found for customer: {name}")