How to Resolve FileNotFoundError in Python When Using a Relative Path?

Troubleshooting FileNotFoundError in Python

In Python, attempting to open a non-existent file can lead to a FileNotFoundError. One common situation where this occurs is when a relative path is used, which assumes the file is in the current working directory.

Consider the following code:

<code class="python">fileName = input("Please enter the name of the file you'd like to use.")
fileScan = open(fileName, 'r')</code>

If the user enters "test.rtf" and the file is not located in the current working directory, you will encounter the FileNotFoundError.

Solution:

To resolve this issue, ensure one of the following:

• Specify Absolute Path: Provide the full path to the file, starting with a slash (e.g., "/Users/username/Desktop/test.rtf").
• Use Relative Path: If the script and data file are in the same directory, a relative path will suffice. However, be aware that this path may vary depending on where the script is executed.
• Change Current Working Directory: Before running the script, cd to the directory containing the data file using the terminal.

Recommendation for macOS:

For macOS systems, it is recommended to use the terminal (command line). Start the terminal, cd to the directory containing the data file, and then execute the Python script using the command:

<code class="bash">$ python script.py</code>

Additional Information:

• The PATH environment variable contains directories for executable searches. Ensure it includes the directory containing the Python executable.
• Always indicate either a relative or absolute path when the data file and script are not in the same directory.

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