FileNotFoundError: No Such File or Directory

Why This Happens

Relative file paths are resolved from the current working directory, which may differ from the script's directory. Use __file__ to build paths relative to the script.

The Problem

with open('data/config.json') as f:
    config = json.load(f)

The Fix

from pathlib import Path
script_dir = Path(__file__).parent
config_path = script_dir / 'data' / 'config.json'
with open(config_path) as f:
    config = json.load(f)

Step-by-Step Fix

1. 1

   Check the working directory

   Print os.getcwd() to verify.

2. 2

   Use absolute paths

   Build paths with Path(__file__).parent / 'filename'.

3. 3

   Verify the file exists

   Use Path(path).exists() to check before opening.