Is there a material that wont allow magnetic field to pass through? Is it possible to ecapsulate the magnet?
call the DNR - Department of Natural Resources - in your state and county they will help you with the snakes and take care of them for you
do not touch the eggs! you would need an incubator not a fish tank, they're probably dead by now 3 snakes in an old fish tank? not safe and why would you let any python go in a creek? do you live in the amazon? no? then let them be!
yes, gamma rays are not affected by the magnetic field.
Yes. Any superconductor will do. In principle, you could build a superconducting box, put a magnet inside, and detect no field outside.
aluminum will not pass a magnetic field. they use it to shield speakers so that the magnetic fields they cause will not destroy television tubes.