A 'FileNotFoundError' occurs when Python cannot find the file you are trying to open. Verify the file path, ensure the file exists, and check your working directory to avoid this error.

The 'FileNotFoundError' is a common issue that arises when attempting to access a file that Python cannot locate. This error typically occurs for several reasons, including an incorrect file path, the file not existing, or issues related to the working directory. To troubleshoot this error, start by carefully examining the file path you are providing to the open function. Ensure that it is accurate, including the correct spelling and case sensitivity. If you are using a relative path, be aware that it is relative to the current working directory, which may not be what you expect. You can use the os.getcwd() function to check your current working directory, and adjust your file path accordingly. If the file is meant to be created by your program and it doesn’t exist, make sure that the directory exists and that your program has the appropriate permissions to create files in that directory. By systematically checking these factors, you can effectively diagnose and resolve FileNotFoundErrors in your Python applications.