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If it's a python or boa or similar species, you're a dolt. If it was known to be nonvenemous regardless of species you're a huge dolt. If it was a venemous species that was just trying to escape, you're a dolt but possibly slightly less of one. If it was an aggressive animal and you feared for the safety of yourself and others, you're not a dolt but you probably should have made an attempt to find a local snake catcher before beating it.
And dude, if you had to kill it you really should have decapitated it with a shovel or something. Snake skulls are awesome and you missed the chance for an excellent specimen.
Oh, and enjoy the coming rodent invasion.