def __getitem__(self, key: str) -> Any:
""" Get header variable `key` by index operator like:
:code:`drawing.header['$ACADVER']`
"""
try:
return self.hdrvars[key].value
except KeyError: # map exception
raise const.DXFKeyError(str(key))
def __delitem__(self, key: str) -> None:
""" Delete header variable `key` by index operator like:
:code:`del drawing.header['$ANGDIR']`
"""
try:
del self.hdrvars[key]
except KeyError: # map exception
raise const.DXFKeyError(str(key))
def _headervar_factory(self, key: str, value: Any) -> DXFTag:
if key in HEADER_VAR_MAP:
factory = HEADER_VAR_MAP[key].factory
return factory(value)
else:
raise const.DXFKeyError(f"Invalid header variable {key}.")