PY

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

People

 * Eugène Py, a French cinema pioneer of the Cinema of Argentina
 * Jorge Py, a Brazilian footballer
 * Olivier Py, a French stage director, actor and writer
 * Delphine Py-Bilot, a French triathlete
 * Piye, a Kushite king and founder of the Twenty-fifth dynasty of Egypt
 * Pierre-Yves Gerbeau, French businessman

Science and technology

 * Python (programming language), which uses the filename extension '.py'
 * .py, the country code top level domain (ccTLD) for Paraguay
 * py (unit), a Korean unit of floorspace area
 * petayear, Py, 1015 year
 * Py (cipher), a stream cipher designed by Eli Biham and Jennifer Seberry
 * p-y method, for assessing the load-bearing abilities of deep foundations
 * Permalloy, a nickel-iron magnetic alloy
 * Pyridine, a common monodentate ligand in coordination chemistry, abbreviated as 'py'

Other uses

 * Py, Pyrénées-Orientales, a commune of the Pyrénées-Orientales département in southwestern France
 * Pack year, a measure of cigarette smoking
 * Paraguay, ISO 3166-1 country code
 * Puducherry, formerly Pondicherry, a union territory of India
 * Pinyin, a system of romanization (phonetic notation and transliteration to Roman script) for Mandarin Chinese
 * Portsmouth yardstick, used as a rating system in yacht racing and dinghy racing
 * Surinam Airways (IATA airline designator PY)
 * A US Navy hull classification symbol: Patrol yacht (PY)