Calculator programs
Try a TI-84 Plus CE Python Program in Your Browser
Try DuckieDai Rectangle Area in an interactive calculator-screen preview before downloading its TI-84 Plus CE Python source. Learn what the preview can and cannot verify.
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Practical, evidence-first guidance
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Python
Python Code Scanner Guide: Inspect, Check, and Clean Up Source
Learn how to scan Python code for invisible characters, inspect indentation, check syntax and undefined names, and review cleanup without executing source.
Data cleaning
How to Find Hidden Characters in a CSV Before Importing It
Find stray spaces, tabs, invisible characters, and line breaks in a CSV file before importing it into a database, and fix them without breaking the file.
Data cleaning
Why Your CSV Import Failed: Byte-Order Marks, Encoding, and Line Endings
A CSV import can fail on a hidden byte-order mark, the wrong text encoding, or mixed line endings. Learn how to spot each one and fix it.
Use findings as a starting point
Automated inspection can surface evidence that deserves attention, but it cannot determine a person’s intent or guarantee that every hidden element was found. Verify important findings in the source document and preserve the original file when documenting a concern.