code: def find_industry(htmlTree):
      ret = None
      anchor = htmlTree.xpath(
          "//th[1][text() = 'Industry:']/../td/a[1]/text()"
      )
      if anchor:
          ret = anchor[0]
      return ret
  
file_path: pyalgotrade/tools/symbols/get_merval_symbols.py
imports: import sys
  import pyalgotrade.logger
  import lxml.html
  import symbolsxml
label_desc: Use image node_id 3 for calling a global function with example usage: find_industry(htmlTree) and returns: ret