Python代码AttributeError问题：'NoneType'对象没有属性'title'
我正在尝试在下面运行以下代码，但该代码始终失败，并显示标题中的错误：
追溯（最近一次通话最近）：文件“ /usr/local/lib/python2.7/dist-packages/cherrypy/_cprequest.py”，行670，在response response.body = self.handler（）文件“ / usr /local/lib/python2.7/dist-packages/cherrypy/lib/encoding.py“，行217，在调用 self.body = self.oldhandler（* args，** kwargs）文件” / usr / local / lib /python2.7/dist-packages/cherrypy/_cpdispatch.py”，第61行，在调用中 返回self.callable（* self.args，** self.kwargs）文件“ web / 800-53-server.py”，家庭control_list.append（' ％s-％d-％s'％（id，control，id，control，sc.title.title）中的第79行）AttributeError：'NoneType'对象没有属性'title'
似乎出错的代码块如下：
@cherrypy.expose
def family(self, id="AC", format="html"):
id = id.upper()
family_control_count = {"AC": 25, "AU": 16, "AT": 5, "CM": 11, "CP": 13, "IA": 11, "IR": 10, "MA": 6, "MP": 8,
"PS": 8, "PE": 20, "PL": 9, "PM": 16, "RA": 6, "CA": 9, "SC": 44, "SI": 17, "SA": 22}
families = {"AC": "Access Control", "AU": "Audit and Accountability", "AT": "Awareness and Training", "CM": "Configuration Management",
"CP": "Contingency Planning", "IA": "Identification and Authentication", "IR": "Incident Response", "MA": "Maintenance",
"MP": "Media Protection", "PS": "Personnel Security", "PE": "Physical and Environmental Protection", "PL": "Planning",
"PM": "Program Management", "RA": "Risk Assessment", "CA": "Security Assessment and Authorization",
"SC": "System and Communications Protection", "SI": "System and Information Integrity", "SA": "System and Services Acquisition"}
control_list = []
for control in range(1,family_control_count[id]+1):
sc = SecControl("%s-%d" % (id, control))
control_list.append('<div><a href="/control?id=%s-%d">%s-%d</a> - %s</div>' % (id, control, id, control, sc.title.title))
return """<html>
白板的微信1回答
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一只名叫tom的猫
包GovReady（我假设这是基于import语句使用的）依赖xsltproc。您可能已将其安装在mac OS上，但未安装在其他计算机上。sudo apt install xsltproc由于它不是pip软件包，因此需要根据您的Linux风格进行安装或与之等效。尝试xsltproc --stringparam controlnumber 'AC-1' control2json.xsl ../data/800-53-controls.xml从您的800-53-server/lib目录运行。您正在调用的函数是该命令的包装器。安装该程序后，我得到{ "id": "AC-1", "title": "ACCESS CONTROL POLICY AND PROCEDURES",...}
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