help me please here

[Excream]

i bought a snake
the man that i bought it say it is
a WATER PYTHON
but i try to search it in internet
But it dint match the color of that snake that i'm finding.

this how it look like
it look like a python
dark green color
with black spots
yellowish under neath
with black spots too
i\the size of the snake is about 3 feet

please help here
tnx guys
respect