def get_ctl_field(self, controlfield, alt=None):
if not alt:<EOL><INDENT>return self.controlfields[controlfield]<EOL><DEDENT>return self.controlfields.get(controlfield, alt)<EOL>
Method wrapper over :attr:`.controlfields` dictionary.

Args:
    controlfield (str): Name of the controlfield.
    alt (object, default None): Alternative value of the `controlfield`
        when `controlfield` couldn't be found.

Returns:
    str: record from given `controlfield`