[Cryptography] Question on crypto implementation in existing python libraries

[Robert Musser]

I had the idea of making a simple application in python that would only
encrypt/decrypt a file dragged onto the window or decrypt an encrypted file
dropped onto the window using strong symmetric encryption. I say python as
its the language I'm most comfortable with.

I thought there would be an existing library that would be able to abstract
away almost all of the crypto implementation behind an API, in that I would
not need to build one using primitives, but so far I have been unable to
find anything except for "cryptography"
https://github.com/pyca/cryptography

Which I'm not too keen on using as the only "recipe" available is for
symmetric encryption using AES 128 in CBC mode, which, from googling a bit
seems relatively weak.

Are there any existing crypto libraries that are available with a more
secure encryption method?

The goal is for it to be free/open, and  available on Win/OSX/Linux.
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