I need to copy a file from one location to another, and I need to throw an exception (or at least somehow recognise) if the file already exists at the destination (no overwriting). I can check first with os.path.exists() but it's extremely important that the file cannot be created in the small amount of time between checking and copying. Is there a built-in way of doing this, or is there a way to define an action as atomic? Continue reading...
