The snake pictured is most definitely not an Anaconda. It is a Reticulated Python (Python Reticulatus) which only occurs in South-East Asia (Indonesia, Malaysia, Singapore, Thailand, Cambodia). The Reticulated Python has been known to get as large as 33' long and while very, very rare, it has attacked humans. Its normal diet is rodents, with the larger snakes occasionally eating a small goat or pig. They are very intelligent and alert snakes.
They are constrictors (non-venomous) which means they wrap around it and squeeze to eventually suffocate their prey. I'm quite familiar with them as I've got a smaller variety of a Reticulated Python as a pet.
Anacondas live in South America in the Amazon basin. They too get huge, but they have very different markings--generally they are dark green with black or yellow spots/blotches. Their pattern is much less ornate and geometric than the Reticulated Python.
The photos you found are semi-famous in the world of snake enthusiasts. While the python pictured definitely has a large meal in it's stomach, there is debate as to whether or not the picture with the man was staged or not. Who knows, but interesting pictures nonetheless.