| Problem | Likely Cause | The "Work" Fix | | :--- | :--- | :--- | | IndentationError: unexpected indent | PDF preserved spaces but mixed tabs/spaces. | Use python -m tabnanny yourfile.py to detect issues. Replace tabs with 4 spaces. | | SyntaxError: invalid character | PDF used a non-breaking space or em dash. | Open in Notepad++ or VS Code; turn on "Show Whitespace" and delete invisible chars. | | Code runs but output differs from book | Python version mismatch (2 vs 3). | Run python --version . Convert all print "x" to print("x") . Convert / to // for integer division. | | PDF is password locked | DRM protection from publisher. | Use Calibre (with DeDRM plugin) if you own the license. Do not crack commercial PDFs. |
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