def check_color_input(value):
    """Check a value is a valid colour input.

    Returns a parsed `RGBColor` instance if so, raises ValueError
    otherwise.

    """
    value = value.lower()
    # Trim a leading hash
    if value.startswith('#'):
        value = value[1:]

    if len(value) != 6:
        raise ValueError(
            'Color should be six hexadecimal digits, got %r (%s)' %
            (value, len(value)))

    if re.sub(r'[a-f0-9]', '', value):
        raise ValueError(
            'Color should only contain hex characters, got %r' % value)

    red = int(value[0:2], base=16)
    green = int(value[2:4], base=16)
    blue = int(value[4:6], base=16)
    return RGBColor(red, green, blue)
def check_color_input ( value ) : value = value . lower ( ) if value . startswith ( '#' ) : value = value [ 1 : ] if len ( value ) != 6 : raise ValueError ( 'Color should be six hexadecimal digits, got %r (%s)' % ( value , len ( value ) ) ) if re . sub ( r'[a-f0-9]' , '' , value ) : raise ValueError ( 'Color should only contain hex characters, got %r' % value ) red = int ( value [ 0 : 2 ] , base = 16 ) green = int ( value [ 2 : 4 ] , base = 16 ) blue = int ( value [ 4 : 6 ] , base = 16 ) return RGBColor ( red , green , blue )
Check a value is a valid colour input.

    Returns a parsed `RGBColor` instance if so, raises ValueError
    otherwise.