@classmethod<EOL><INDENT>def get_header(cls, script_text="<STR_LIT>", executable=None):<DEDENT>
cmd = cls.command_spec_class.best().from_param(executable)<EOL>cmd.install_options(script_text)<EOL>return cmd.as_header()<EOL>
Create a #! line, getting options (if any) from script_text