将特定xml标记的值插入python元组 下面是xml文件：Results.xml 错误：

请在这方面帮助我

您遇到的问题是，在第一个标签中，您没有CMV_FREQ，因此当您尝试使用它时，它会失败：

>>> for combin in root.findall('Combination'):
...    for param in  combin.getiterator('Parameter'):
...        param.get('CMV_FREQ').text
... 
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
AttributeError: 'NoneType' object has no attribute 'text'

另一个问题 peep=rr=[] 使peep==rr 因此，当您更改rr时，peep也将更新 如果您将代码保持原样，那么结果应该是

[((None, '1.0'), 'true'), ((None, '4.0'), 'false')] [((None, '1.0'), 'true'), ((None, '4.0'), 'false')]

而不是：

[((None, '1.0'), 'true')] [((None, '4.0'), 'false')]

peep = ((PEEP, 1.0), true)        # I want to check the tag before enter value and corresponding true will be insert into variable
rr   = ((CMV_FREQ, 4.0), false)

>>> for combin in root.findall('Combination'):
...    for param in  combin.getiterator('Parameter'):
...        param.get('CMV_FREQ').text
... 
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
AttributeError: 'NoneType' object has no attribute 'text'

  for combin in root.findall('Combination'):
    peep = []
    rr = []
    print 1
    for param in combin.getiterator('Parameter'):
      if param.find('PEEP') is not None: ##This will check if PEEP tag exists
         peep.append(((param.get('PEEP'), param.find('PEEP').text), param.find('Result').text))
      elif  param.find('CMV_FREQ') is not None:##This will check if CMV_FREQ tag exists
         rr.append(((param.get('CMV_FREQ'), param.find('CMV_FREQ').text), param.find('Result').text))
    print peep, rr

[((None, '1.0'), 'true'), ((None, '4.0'), 'false')] [((None, '1.0'), 'true'), ((None, '4.0'), 'false')]

[((None, '1.0'), 'true')] [((None, '4.0'), 'false')]