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[Inkslinger]

A good first python to buy would be a sub adult or adult one that is an established feeder used to being handled and with no past health issues.

An established python is much easier for a beginner to deal with no snappiness set temperament etc,

Look around in person. (if possible take an experienced person with you)

Handle the python you intend to buy .

Ask to see feeding shed records.

Inquire if the seller has a regular vet for his pythons. (This may be very important in future should your python become ill.)

Look at the set up the python is currently being kept in does it match in size yours?

Note substrate, lighting, heating and temperatures,

Note if the enclosure is in a high traffic area or a quite out of the way spot. This will enable you to ease your python into his new home with little stress. Ask if you can take the substrate with you as this will also aid as a comforter to the animal as it will have his smell on it.

When you have decided on your python ask the seller if you can observe it being fed.

Don't jump at the first python you see you will know the one that is right for you.

As to species do your research first they are so varied in price, size, attitude and husbandry. All of this must be taken into account, not just which one is the best looking.

Remember Pythons live a very long time so this is a big commitment.
Tread carefully, ask questions, research and go slowly and you wont be disappointed.