text: from random import sample
  from os import listdir, rmdir, remove
  from os.path import join, basename
  from tqdm import tqdm
  import shutil
  import tarfile
  import wget
  from xml.etree import ElementTree
  
  BASE_URL = 'https://ftp.ncbi.nlm.nih.gov/pub/pmc/{}'
  
  PATH = './try/packs/'
  UNPACK_PATH = './try/training/'
  
  with open('./oa_file_list.txt', 'r') as oa:
      lines = oa.readlines()[1:]
      totalGrabbed = 0
      for file in lines:
          url = file.split('\t')[0]
          fileName = url.split('/')[-1]
          wget.download(BASE_URL.format(url), './try/packs/{}'.format(fileName))
  
          tar = tarfile.open(join(PATH, fileName))
          tar.extractall(UNPACK_PATH)
          tar.close()
  
          xml = ""
          unpacked_folder_name = fileName.split('.')[0]
          for f in listdir(join(UNPACK_PATH, unpacked_folder_name)):
              if ".nxml" in basename(f):
                  xml = join(UNPACK_PATH, unpacked_folder_name, f)
  
          tree = ElementTree.parse(xml)
          root = tree.getroot()
          abstract = ""
          for p in root.findall("front/article-meta/abstract/sec/p"):
              abstract += " ".join(p.itertext())
  
          if abstract != '':
              totalGrabbed += 1
          else:
              shutil.rmtree(join(UNPACK_PATH, unpacked_folder_name))
              remove(join(PATH, fileName))
  
          if totalGrabbed == 1000:
              break
  