XML : Loop problems parsing xml tree

I need to parse many xml trees sequentially... I did a 'for' loop and it works perfectly for the first file, bur when starting the second it just takes forever and never prints the answer or follows for the other files.

I have 3 files that are all copies from a same file with diffente names to try the loop, the files are named as follow:

Medline_01.xml
Medline_02.xml
Medline_03.xml

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I'm trying the followign loop:

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  import xml.etree.cElementTree as etree      import os    path = '/Users/brunap/Desktop/Work/Medline'     listing = os.listdir(path)     for file in listing:           if file.endswith('.xml'):                 print file                     data = os.path.join(path, file)                 tree=etree.parse(data)                 root = tree.getroot()                 print root                     print ""    

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It gives me the following result

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Medline_01.xml
< Element 'PubmedArticleSet' at 0x10878bd80 >

Medline_02.xml

P.S.:And from this I wait for 2h and nothing happens. The first one took 15min

some one can help me with that?