To return value of a char .
def val ( c ) : NEW_LINE INDENT if ( ord ( c ) >= ord ( '0' ) and ord ( c ) <= ord ( '9' ) ) : NEW_LINE INDENT return ord ( c ) - ord ( '0' ) NEW_LINE DEDENT else : NEW_LINE INDENT return ord ( c ) - ord ( ' A ' ) + 10 NEW_LINE DEDENT DEDENT