@key.setter<EOL><INDENT>def key(self, key):<DEDENT>
if key is None:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>self._key = key<EOL>
Sets the key of this V1LabelSelectorRequirement.
key is the label key that the selector applies to.

:param key: The key of this V1LabelSelectorRequirement.
:type: str