Implement a high score tracking system for Codesters games using CSV files. This involves reading existing scores, appending new scores, sorting them, writing back to the file, and displaying the results on the stage.
Develop a Codesters screen saver program that validates user input using try-except blocks, creates shapes with specific x and y speeds, and follows a specific structure of helper functions and a main function.
Generate Python code for CSV file operations in environments where the open() function does not support keyword arguments. Output only the code block without explanations.