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import enum
class StrEnum(str, enum.Enum):
"""
Enum where members are also (and must be) strings (backported from Python 3.11).
"""
def __new__(cls, *values: str) -> "StrEnum":
"values must already be of type `str`"
if len(values) > 3:
raise TypeError("too many arguments for str(): %r" % (values,))
if len(values) == 1:
# it must be a string
if not isinstance(values[0], str): # type: ignore
raise TypeError("%r is not a string" % (values[0],))
if len(values) >= 2:
# check that encoding argument is a string
if not isinstance(values[1], str): # type: ignore
raise TypeError("encoding must be a string, not %r" % (values[1],))
if len(values) == 3:
# check that errors argument is a string
if not isinstance(values[2], str): # type: ignore
raise TypeError("errors must be a string, not %r" % (values[2]))
value = str(*values)
member = str.__new__(cls, value)
member._value_ = value
return member
@staticmethod
def _generate_next_value_(
name: str, start: int, count: int, last_values: list[str]
) -> str:
"""
Return the lower-cased version of the member name.
"""
return name.lower()
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