> What's the return value of crypt.crypt("test", crypt.METHOD_SHA512) 

This is from my Mac (10.13.3):

$ python3.6
Python 3.6.4 (v3.6.4:d48ecebad5, Dec 18 2017, 21:07:28)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import crypt
>>> crypt.crypt("test", crypt.METHOD_SHA512)
'$6asQOJRqB1i2'
>>> crypt.crypt("test", crypt.METHOD_SHA512)
'$6asQOJRqB1i2'
>>> crypt.crypt("test", "$5")
'$5yVOkTkyRzn.'
>>> crypt.crypt("test", "$6")
'$6asQOJRqB1i2'
>>> crypt.crypt("test", "$7")
'$7tSOkvDyiL6U'
>>> crypt.crypt("test") == crypt.crypt("test")
False
>>> crypt.crypt("test", crypt.mksalt()) == crypt.crypt("test", crypt.mksalt())
False