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from semver import Version
class SemVerWithVPrefix(Version):
"""
A subclass of Version which allows a "v" prefix
"""
@classmethod
def parse(cls, version: str) -> "SemVerWithVPrefix":
"""
Parse version string to a Version instance.
:param version: version string with "v" or "V" prefix
:raises ValueError: when version does not start with "v" or "V"
:return: a new instance
"""
if not version[0] in ("v", "V"):
raise ValueError(
f"{version!r}: not a valid semantic version tag. "
"Must start with 'v' or 'V'"
)
return super().parse(version[1:], optional_minor_and_patch=True)
def __str__(self) -> str:
# Reconstruct the tag
return "v" + super().__str__()
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