How to Solve Python's `FileNotFoundError` When Opening Files?

File Not Found: Dealing with 'FileNotFoundError' in Python

Attempting to open a file named 'recentlyUpdated.yaml' using 'open('recentlyUpdated.yaml')' can result in a 'FileNotFoundError' or 'IOError' indicating 'No such file or directory.' This issue arises due to Python's search mechanism for files.

Understanding File Paths

Python searches for files based on the concept of paths:

• Absolute Path: Begins with the root directory (e.g., C:Pythonscripts on Windows)
• Relative Path: Doesn't start with the root directory but is relative to the current working directory

Troubleshooting the Error

To diagnose the problem:

1. File Existence: Verify that 'recentlyUpdated.yaml' exists and has the correct file extension.
2. Working Directory: Ensure you are in the expected directory using 'os.getcwd()'. (If launching code from an IDE, you may be in a different directory.)

Resolving the Issue

Once the issue is diagnosed, you can resolve it by:

1. Changing the Working Directory: Use 'os.chdir(dir)' to navigate to the directory containing the file and then open it using its name (e.g., 'open("file.txt")').
2. Specifying Absolute Path: Provide the absolute path to the file in the 'open' call (e.g., 'open(r'C:Folderfile.txt')').

Additional Tips

• Use 'raw strings' for paths containing backslashes (e.g., 'r'C:Folder').
• Forward-slashes also work on Windows ('C:/Folder') without needing escaping.

Example

If 'file.txt' is located in C:Folder, you can open it using:

os.chdir(r'C:\Folder')
open('file.txt')  # relative path

or

open(r'C:\Folder\file.txt')  # absolute path

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