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from semver import Version
def test_subclass_from_versioninfo():
class SemVerWithVPrefix(Version):
@classmethod
def parse(cls, version):
if not version[0] in ("v", "V"):
raise ValueError(
"{v!r}: version must start with 'v' or 'V'".format(v=version)
)
return super().parse(version[1:])
def __str__(self):
# Reconstruct the tag.
return "v" + super().__str__()
v = SemVerWithVPrefix.parse("v1.2.3")
assert str(v) == "v1.2.3"
def test_replace_from_subclass():
# Issue#426
# Taken from the example "Creating Subclasses from 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__()
version = SemVerWithVPrefix.parse("v1.1.0")
dev_version = version.replace(prerelease="dev.0")
assert str(dev_version) == "v1.1.0-dev.0"
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