python - how to loop through xml file and save the result into a dataframe -

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i have big xml file without knowing exact structure of file. try loop through xml hierarchies , extract results , put them dataframe. however, code break down after parsed soome text. error returned as

file:"c:\python34\lib....\frame.py", line 4327, in append   elif isinstance(other, list) , not isinstance(other[0], dataframe): indexerror: list index out of range

here code python 3.4:

def getelements(fn):     df = pd.dataframe()         index = 0     context = iter(et.iterparse(fn, events=('start', 'end')))     _, root = next(context)      event, elem in context:         if elem.tag=='row':              alist=[]             index += 1             c = elem.findall('column')              cl in iter(c):                 pair = (str(cl.get('name')), str(cl.text), index)                 alist.append(pair)              df=df.append(alist)        #print out during processing                  print(df[ :index])                 print ("index=%s"%index)      df.to_csv('jv2015.csv', sep=',', quotechar="'")     return df

the xml file seems has "row" element, under "row", there different numbers of "column" element. each "column" element, there attribute "name" , value of attribute. example ..

<row>  <column name="xxx">value</column>  <column name="yyy">value</column>   ... </row>


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