@classmethod<EOL><INDENT>def parameter_constructor(cls, loader, node):<DEDENT>
value = loader.construct_scalar(node)<EOL>if isinstance(value, str):<EOL><INDENT>if '<STR_LIT:=>' in value:<EOL><INDENT>(varname, varvalue) = Parser.parse_equality(value)<EOL>return cls(varname, varvalue)<EOL><DEDENT>else:<EOL><INDENT>return cls(value)<EOL><DEDENT><DEDENT>else:<EOL><INDENT>return cls(value)<EOL><DEDENT>
Construct variable instance from yaml node