Is there a pure Python ECDSA Secp256k1 implementation? I don't care how slow it is, because calling libcrypto in a loop gives me Segmentation fault every 3-4 million loops. I'm using Joric/bitcoin-dev implementation and I've tried to find the cause with gdb, but give up on it, have no more nerves for it.

Using some utility through RPC is not an attractive option because of overhead. If anyone has a link to a native Python solution I would be grateful.