Just realized my file path error was a missing slash for 3 hours
I spent 3 hours last night chasing a FileNotFoundError in a little Python script that reads a CSV. I kept rewriting the open() line, tried full paths, renamed the file twice, even reinstalled pandas like that would fix anything. The whole time the issue was a single missing forward slash in my folder path, so Python was looking in a spot that did not exist. I found it by accident when I dropped a print statement right before the open call and stared at the output. What is the dumbest tiny typo that ate a chunk of your day?