After upgrading to Python 3.7.5, several algorithms are unavailable in the hashlib module.

This seems to have been caused by the "fix" for https://bugs.python.org/issue33936. I will submit a PR with a more appropriate change shortly.

Python 3.7.4:
>>> hashlib.algorithms_available
{'ripemd160', 'blake2s256', 'sha512', 'sha3-224', 'sha3_224', 'blake2s', 'shake_128', 'sha3-384', 'sha3_384', 'whirlpool', 'md4', 'md5', 'sha512-224', 'sha3-512', 'sha1', 'blake2b', 'sha384', 'md5-sha1', 'sha3-256', 'shake_256', 'mdc2', 'sha224', 'blake2b512', 'shake128', 'sm3', 'sha256', 'shake256', 'sha3_512', 'sha512-256', 'sha3_256'}

Python 3.7.5:
>>> hashlib.algorithms_available
{'sha224', 'sha256', 'sha3_224', 'blake2s', 'md5', 'sha3_256', 'sha384', 'sha3_512', 'sha3_384', 'shake_256', 'blake2b', 'sha512', 'shake_128', 'sha1'}