PY

PY, Py, py or P-Y may stand for:

• Pack year, a quantification of cigarette smoking
• Peace by Youth, a local youth-led nonprofit organization from district Jacobabad, Sindh, Pakistan. Details at www.py.org.pk
• Pinyin, a system of romanization (phonetic notation and transliteration to Roman script) for Mandarin Chinese
• Py (cipher), a stream cipher designed by Eli Biham and Jennifer Seberry
• Paraguay, ISO 3166-1 country code
  • .py, the country code top level domain (ccTLD) for Paraguay
• The Python programming language's typical filename extension, '.py'
• The Portsmouth yardstick, used as a rating system in yacht racing and dinghy racing
• Delphine Py-Bilot, a French triathlete
• Eugène Py, a French cinema pioneer of the Cinema of Argentina
• Olivier Py, a French stage director, actor and writer
• Pierre-Yves Gerbeau, French businessman
• Py, Pyrénées-Orientales, a commune of the Pyrénées-Orientales département in southwestern France
• Surinam Airways IATA airline designator
• Pyridine, a common monodentate ligand in coordination chemistry, abbreviated as 'py'
• Permalloy, a nickel-iron magnetic alloy
• Piye, a Kushite king and founder of the Twenty-fifth dynasty of Egypt
• p-y method, for assessing the load-bearing abilities of deep foundations