In the Bharatpur sanctuary north of New Delhi they know where the pythons live (in large burrows). Guides would take you out to see the pythons basking near their burrow mouths. I was there on Christmas day and it was too cool and foggy for any pythons to be out basking. We saw some drag marks near the burrow entrance.
Retics are much more shy snakes and are rarely seen just sitting out. They are usually deep in forested areas or in swampy areas. I have spent some time in their range and never seen any that weren't macheted into pieces.
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Chris Harrison
San Antonio, TX