def _empty_value(self, formattype):
if formattype.value.idx <= FormatType.BIN_32.value.idx:  <EOL><INDENT>return b'<STR_LIT>'<EOL><DEDENT>elif formattype.value.idx <= FormatType.FIXSTR.value.idx:  <EOL><INDENT>return '<STR_LIT>'<EOL><DEDENT>elif formattype.value.idx <= FormatType.INT_64.value.idx:  <EOL><INDENT>return <NUM_LIT:0><EOL><DEDENT>elif formattype.value.idx <= FormatType.UINT_64.value.idx:  <EOL><INDENT>return <NUM_LIT:0><EOL><DEDENT>elif(formattype is FormatType.FLOAT_32):<EOL><INDENT>return float(<NUM_LIT:0>)<EOL><DEDENT>elif(formattype is FormatType.FLOAT_64):<EOL><INDENT>return float(<NUM_LIT:0>)<EOL><DEDENT>
returns default empty value 
:param formattype:
:param buff:
:param start:
:param end: