Trying to get first reptile as pet.

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I've recently been looking into getting my first reptilian pet. Thing is, of course, my mother is vehemently against getting any more pets, and she's definitely not that fond of reptiles. Any tips getting her to cave? I'm really intent on getting a snake (probably a corn snake, I've read that they're good for beginners), but I'm open to other reptiles as well (maybe something with legs would be more manageable for my mother =P). Also, I've heard that snakes have very long lifespans for pets. And I imagine it'd be fairly difficult to rehome a snake if you lost the ability to keep it. I'm trying to plan for the future, like college in two years, and I want to make sure I'm not going to be adopting a pet that I'll end up having to leave behind in a couple of years if I end up living on a campus that doesn't allow pets, or an apartment that doesn't. Any ideas on that? Helps me, I want a reptile.