Operation Python, a follow-up to Operation Trident, was a code name of a naval attack launched on West Pakistan's port city of Karachi by the Indian Navy during the Indo-Pakistani War of 1971. After the first attack during Operation Trident on Karachi port, Pakistan stepped up aerial surveillance of its coast and the presence of large Indian Navy ships gave the impression that another attack was being planned. Pakistan warships attempted to outsmart the Indian Navy by mingling with merchant shipping. To counter these moves, Operation Python was launched on the night on 8/9 December 1971.^[1]

• http://en.wikipedia.org/wiki/Operation Python