ASCII 与 Int

# ord()  char -> ASCII 

# chr() ASCII -> char

def toint( ch ):

    ch = str( c h);  # from hex to dec etc

    if( ch >= '0' and ch <= '9' ):

        return int( ch );

    else:

        return 10 + ord( ch.upper() ) - ord('A');

def tostr(x):  # from dec to hex etc

    x = int(x);

    if( x >= 0 and x <= 9):

        return str( x );

    else:

        return chr( ord( 'A' ) + x-10 );