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Python tools
Every tool below runs Python — the real interpreter, in your browser via Skulpt. No server round-trip, no data upload, no signup. Bookmarkable, works offline once loaded.
Python regex tester
Test patterns instantly with the real re module — lookbehinds, named groups, verbose mode. No JS-regex quirks.
Python JSON formatter
Paste JSON, get it pretty-printed or minified. Errors match json.loads exactly — line + column + char position.
Python timestamp converter
Unix epoch ↔ datetime with any timezone. Real zoneinfo, matches datetime.fromtimestamp exactly.
List comprehension builder
Build list / dict / set / generator comprehensions with a live preview + equivalent for-loop side by side.