QSyntaxHighLighter不要给我错误，只是不要给关键字加上颜色

Question

嗨，我有一个疑问，为什么这段代码不起作用？

def format(color, style=''):

    _color = QColor()
    _color.setNamedColor(color)

    _format = QTextCharFormat()
    _format.setForeground(_color)
    if 'bold' in style:
        _format.setFontWeight(QFont.Bold)
    if 'italic' in style:
        _format.setFontItalic(True)
    return _format


STYLES = {
    'keyword': format('darkBlue'),
    'operator': format('red'),
    'comment': format('darkGreen'),
    'brace': format('darkGray'),
    'function': format('yellow'),
    'string': format('green'),
    'numbers': format('blue')
}


class Highlighter(QSyntaxHighlighter):
    def __init__(self, parent=None):
        super(Highlighter, self).__init__(parent)

        xml_read.read_keywords_from_xml(self)

        array_from_xml = xml_read.xmldata
        self.rules = []

        self.rules += [(QRegExp(pattern), STYLES['keyword'])for pattern in
                  array_from_xml[0]]
        self.rules += [(QRegExp(func), STYLES['function'])for func in
                  array_from_xml[4]]
        self.rules += [(QRegExp(operator), STYLES['operator'])for operator in
                  array_from_xml[1]]
        self.rules.append((QRegExp("//[^\n]*"), STYLES['comment']))

        self.rules += [
        # Numeric light
        (r'\b[+-]?[0-9]+[lL]?\b', 0, STYLES['numbers']),
        (r'\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\b', 0, STYLES['numbers']),
        (r'\b[+-]?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b', 0, STYLES['numbers']),
        ]
        self.commentStartExpression = QRegExp("/*\\")
        self.commentEndExpression = QRegExp("\\*/")

    def highlightBlock(self, text):
        for pattern, format in self.rules:
            expression = QRegExp(pattern)
            index = expression.indexIn(text)
            while index >= 0:
                length = expression.matchedLength()
                self.setFormat(index, length, format)
                index = expression.indexIn(text, index+length)

        self.setCurrentBlockState(0)

        startindex = 0
        if self.previousBlockState() != 1:
            startindex = self.commentStartExpression.indexIn(text)

        while startindex >= 0:
            endIndex = self.commentEndExpression.indexIn(text, startindex)

            if  endIndex == -1:
                self.setCurrentBlockState(1)
                commentlenght = len(text) - startindex
            else:
                commentlenght = endIndex - startindex + self.commentEndExpression.matchedLength()

                self.setFormat(startindex, commentlenght,
                        self.multiLineCommentFormat)
                startindex = self.commentStartExpression.indexIn(text,
                           startindex + commentlenght)

我想将HighLight添加到我的文本编辑器（https://github.com/VarusEx/DEdit/tree/Syntax_Highlighter）中，我很早就这样做了，那写得不好，然后我决定重写他，现在我遇到了问题。代码几乎相同，但是现在从xml文件读取表，并且该表位于主应用程序文件的后面。我真的没看到问题，没有错误就是行不通。