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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 _page_to_text(page):
 """Extract the text from a page. Args: page: a unicode string Returns: a unicode string """

  # text start tag looks like "<text ..otherstuff>"
  start_pos = page.find(u"<text")
  assert start_pos != -1
  end_tag_pos = page.find(u">", start_pos)
  assert end_tag_pos != -1
  end_tag_pos += len(u">")
  end_pos = page.find(u"</text>")
  if end_pos == -1:
    return u""
  return page[end_tag_pos:end_pos]