Python错误-TypeError：+：'NoneType'和'str'不支持的操作数类型

Question

I am trying to debug an existing script and got the below error when I run the script. ./check_tandbergvideo CE s 10.50.174.138 This script tries to check if an endpoint is registered or not registered and returns status.

Traceback (most recent call last): File "./check_tandbergvideo", line 156, in main() File "./check_tandbergvideo", line 114, in main EP = getXML(sys.argv[3],sys.argv[1]) File "./check_tandbergvideo", line 79, in getXML H323Status = getElement(tree,xml2+"H323/"+xml2+"Gatekeeper/"+xml2+"Status") + ". Errors: " + getElement(tree,xml2+"H323/"+xml2+"Gatekeeper/"+xml2+"Reason")
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

Here is the part of code that throws the error.

if model == "CE":
  # SIPStatus =  getElement(tree,xml2+"SIP/"+xml2+"Registration/"+xml2+"Status") + ". Errors: " + getElement(tree,xml2+"SIP/"+xml2+"Registration/"+xml2+"Reason")
    SIPStatus =  str(getElement(tree,xml2+"SIP/"+xml2+"Profile/"+xml2+"Registration/"+xml2+"Status")) + ". Errors: " + str(getElement(tree,xml2+"SIP/"+xml2+"Profile/"+xml2+"Registration/"+xml2+"Reason"))
    H323Status = getElement(tree,xml2+"H323/"+xml2+"Gatekeeper/"+xml2+"Status") + ". Errors: " + getElement(tree,xml2+"H323/"+xml2+"Gatekeeper/"+xml2+"Reason")
    ReleaseKey =   getElement(tree,xml2+"SystemUnit/"+xml2+"Software/"+xml2+"ReleaseKey")
    EPModel = getElement(tree,xml2+"SystemUnit/"+xml2+"ProductId")
SWVer =getElement(tree,xml2+"SystemUnit/"+xml2+"Software/"+xml2+"Version")
    else:
    badSyntax()
EPData = {"Model":EPModel,"SIP":SIPStatus,"H323":H323Status,"RK":ReleaseKey,"SW":SWVer}
return(EPData)

Could you please verify if the second line of the code H323 has correct syntax?

Answer 1

It's not an error in your script. It just says TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' that basically means that it can't combine None and "string" . You should do str(None)+"string" or put some condition if s == None: do something to avoid.

Answer 2

非常感谢大家的宝贵意见...我尝试了一下，它奏效了。

H323Status = str(getElement(tree,xml2+"H323/"+xml2+"Gatekeeper/"+xml2+"Status")) + ". Errors: " + str(getElement(tree,xml2+"H323/"+xml2+"Gatekeeper/"+xml2+"Reason"))