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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def newTextReaderFilename(URI):
 """Create an xmlTextReader structure fed with the resource at @URI """

    ret = libxml2mod.xmlNewTextReaderFilename(URI)
    if ret is None:raise treeError('xmlNewTextReaderFilename() failed')
    return xmlTextReader(_obj=ret)