Version equality means for semver, that major, minor, patch, and prerelease parts are equal in both versions you compare. The build part is ignored. For example:

>>> v = Version.parse("1.2.3-rc4+1e4664d")
>>> v == "1.2.3-rc4+dedbeef"
True

This also applies when a :class:`Version <semver.version.Version>` is a member of a set, or a dictionary key:

>>> d = {}
>>> v1 = Version.parse("1.2.3-rc4+1e4664d")
>>> v2 = Version.parse("1.2.3-rc4+dedbeef")
>>> d[v1] = 1
>>> d[v2]
1
>>> s = set()
>>> s.add(v1)
>>> v2 in s
True