@value_from.setter<EOL><INDENT>def value_from(self, value_from):<DEDENT>
self._value_from = value_from<EOL>
Sets the value_from of this V1EnvVar.
Source for the environment variable's value. Cannot be used if value is not empty.

:param value_from: The value_from of this V1EnvVar.
:type: V1EnvVarSource