Reading XML data

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adam291086 adam291086 is offline Offline
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Reading XML data

 
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  #1
Nov 24th, 2008
I am trying to read in a simple xml file and display all the child elements all i get is the error

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Traceback (most recent call last):
File "/Users/adamplowman/Documents/Uni/project/python/test_xml.py", line 10, in <module>
for element in tree:
TypeError: iteration over non-sequence
Here is the xml file

Python Syntax (Toggle Plain Text) 
  1. <root><child>One</child><child>Two</child></root>

and this is the python file

Python Syntax (Toggle Plain Text) 
  1. #!/usr/bin/env python
  2.  
  3. from xml.etree import ElementTree as ET
  4.  
  5. try:
  6.     tree = ET.parse('/Users/adamplowman/Desktop/sample.xml')
  7. except Exception, inst:
  8.     print "Unexpected error opening"
  9.  
  10. for subelement in tree:
  11.     print subelement.text

if i do this within the python file

Python Syntax (Toggle Plain Text) 
  1. #!/usr/bin/env python
  2.  
  3. from xml.etree import ElementTree as ET
  4.  
  5. def main():
  6. 	element = ET.XML("<root><child>One</child><child>Two</child></root>")
  7. 	for subelement in element:
  8. 		print subelement.text
  9.  
  10. if __name__ == "__main__":
  11. 	# Someone is launching this directly
  12. 	main()

everything works fine. I am using this website for help http://www.learningpython.com/2008/0...dingfromtheWeb

any help is appreciated
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Re: Reading XML data

 
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  #2
Nov 24th, 2008
i have solved the problem with this script
Python Syntax (Toggle Plain Text) 
  1. #!/usr/bin/env python
  2.  
  3. from xml.etree import ElementTree as ET
  4. import os
  5. import urllib
  6.  
  7.  
  8. feed = urllib.urlopen("http://server-up.theatticnetwork.net/demo/")
  9. try:
  10.     tree = ET.parse(feed)
  11.  
  12. except Exception, inst:
  13.     print "Unexpected error opening %s: %s" % (tree, inst)
  14.  
  15. root= tree.getroot()
  16.  
  17. for subelement in root:
  18.     if subelement.text is None:
  19.        for subelement in subelement:
  20.            if subelement.text is None:
  21.                for subelement in subelement:
  22.                    if subelement.text is None:
  23.                        for subelement in subelement:
  24.                            print subelement.text
  25.                    else:
  26.                         print subelement.text
  27.            else:
  28.                print subelement.text
  29.     else: print subelement.text

can anyone see how i could improve the looping

Python Syntax (Toggle Plain Text) 
  1. for subelement in root:
  2.     if subelement.text is None:
  3.        for subelement in subelement:
  4.            if subelement.text is None:
  5.                for subelement in subelement:
  6.                    if subelement.text is None:
  7.                        for subelement in subelement:
  8.                            print subelement.text
  9.                    else:
  10.                         print subelement.text
  11.            else:
  12.                print subelement.text
  13.     else: print subelement.text
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Re: Reading XML data

 
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  #3
Nov 24th, 2008
I suggest a generator
python Syntax (Toggle Plain Text) 
  1. def find_text(element):
  2.     if element.text is None:
  3.         for subelement in element:
  4.             for txt in find_text(subelement):
  5.                 yield txt
  6.     else:
  7.         yield element.text
  8.  
  9. for txt in find_text(root):
  10.     print txt
Last edited by Gribouillis; Nov 24th, 2008 at 11:25 am.
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Re: Reading XML data

 
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  #4
Nov 24th, 2008
That works beautifully and i understand it. How would i go about inserting the error name as a key within a dictionary and having the value as element.text
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Re: Reading XML data

 
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  #5
Nov 25th, 2008
ok i have sorted out the dictionary stage. Now to build on the coding. I have the xml file like

<Network>
<NetDevice>
<Name>lo</Name>
<RxBytes>2596219</RxBytes>
<TxBytes>2596219</TxBytes>
<Errors>0</Errors>
<Drops>0</Drops>
</NetDevice>
<NetDevice>
<Name>eth1</Name>
<RxBytes>0</RxBytes>
<TxBytes>0</TxBytes>
<Errors>0</Errors>
<Drops>0</Drops>
</NetDevice>
<NetDevice>
<Name>eth0</Name>
<RxBytes>292008101</RxBytes>
<TxBytes>3198114577</TxBytes>
<Errors>0</Errors>
<Drops>0</Drops>
</NetDevice>

i want to pull out the indivdual section of information, Netdevice, and store it in its own dictionary.

the full xml is stored http://server-up.theatticnetwork.net/demo/

any clues are appreciated
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