Why Am I Getting a 'File Not Found' Error When Opening a File in Python?

File Not Found Error in open()

When attempting to open the 'recentlyUpdated.yaml' file using 'open('recentlyUpdated.yaml')', an error message indicating "IOError: [Errno 2] No such file or directory" appears. This error typically occurs when the file is either missing or not located in the expected directory.

Python's file access is dependent on paths, which can be either absolute or relative. Absolute paths indicate the file's location from the root directory, while relative paths rely on the current working directory. In this case, Python interprets 'recentlyUpdated.yaml' as a relative path and searches for the file in the current working directory.

Diagnostics:

• Verify the file's existence and correct file extension by using 'os.listdir()' to list files in the current working directory.
• Confirm the current directory using 'os.getcwd()'. If running the code from an IDE, the current directory may differ from the expected location.

Solutions:

• Change the current working directory to the one containing the file using 'os.chdir(dir)'. Subsequently, open the file using only its name, e.g., 'open("file.txt")'.
• Specify an absolute path in the open call.

Raw Strings for Paths:

When paths include backslashes, consider using a raw string (r""). This prevents the backslashes from being interpreted as escape characters. For example: 'dir = r'C:Python32''.

Example:

Assuming 'file.txt' is in 'C:Folder', open it using:

• Relative path: 'os.chdir(r'C:Folder'); open('file.txt')'
• Absolute path: 'open(r'C:Folderfile.txt')'

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