old_contents: import datetime
  import os
  import tempfile
  
  import requests
  
  from pyhis import util
  
  NCDC_GSOD_DIR = os.path.join(util._get_pyhis_dir(), 'ncdc_gsod')
  NCDC_GSOD_START_YEAR = 1929
  
  
  def _init_temp_dir():
      if not os.path.exists(NCDC_GSOD_DIR):
          os.mkdir(NCDC_GSOD_DIR)
  
  
  def retrieve_ncdc_gsod_files(historical=False, start_year=None, end_year=None):
      """ retrieves Global Summary of Day data from ncdc and saves files in data directory
  
      Parameters
      ----------
      start_year : year to start downloads. default to current year
      end_year : year to end downloads. default to current year.
      historical : retrieves all available data. i.e start_year=1928, end_year = current year
  
      default retrieves current year. NCDC GSOD data is updated daily
      """
      _init_temp_dir()
      if historical:
          start_year = NCDC_GSOD_START_YEAR
          end_year = datetime.datetime.now().year
  
      if not end_year:
          end_year = datetime.datetime.now().year
  
      if not start_year:
          start_year = datetime.datetime.now().year
  
      base_url = 'http://www1.ncdc.noaa.gov/pub/data/gsod/'
      CHUNK = 64 * 1024
      for year in range(start_year, end_year + 1):
          url = base_url + '/' + str(year) + '/' + 'gsod_' + str(year) + '.tar'
          filename = os.path.join(NCDC_GSOD_DIR, url.split('/')[-1])
          print 'retrieving ncdc gsod tar data file for {0}'.format(year)
          r = requests.get(url)
          download = r.raw
          with open(filename, 'wb') as f:
              # https://gist.github.com/1311816
              while True:
                  chunk = download.read(CHUNK)
                  if not chunk:
                      break
                  f.write(chunk)
  
          print 'file saved at {0}'.format(filename)
  
  
  if __name__ == '__main__':
      retrieve_ncdc_gsod_files(historical=True)
  
new_contents: import datetime
  import os
  
  import requests
  
  from pyhis import util
  
  NCDC_GSOD_DIR = os.path.join(util._get_pyhis_dir(), 'ncdc_gsod')
  NCDC_GSOD_START_YEAR = 1929
  
  
  def _init_temp_dir():
      if not os.path.exists(NCDC_GSOD_DIR):
          os.mkdir(NCDC_GSOD_DIR)
  
  
  def download_ncdc_gsod_files(historical=False, start_year=None, end_year=None):
      """downloads Global Summary of Day data from ncdc and saves files in data directory
  
      Parameters
      ----------
      start_year : year to start downloads. default to current year
      end_year : year to end downloads. default to current year.
      historical : retrieves all available data. i.e start_year=1928, end_year = current year
  
      default retrieves current year. NCDC GSOD data is updated daily
      """
      _init_temp_dir()
      if historical:
          start_year = NCDC_GSOD_START_YEAR
          end_year = datetime.datetime.now().year
  
      if not end_year:
          end_year = datetime.datetime.now().year
  
      if not start_year:
          start_year = datetime.datetime.now().year
  
      base_url = 'http://www1.ncdc.noaa.gov/pub/data/gsod/'
      CHUNK = 64 * 1024
      for year in range(start_year, end_year + 1):
          url = base_url + '/' + str(year) + '/' + 'gsod_' + str(year) + '.tar'
          filename = os.path.join(NCDC_GSOD_DIR, url.split('/')[-1])
          print 'retrieving ncdc gsod tar data file for {0}'.format(year)
          r = requests.get(url)
          download = r.raw
          with open(filename, 'wb') as f:
              # https://gist.github.com/1311816
              while True:
                  chunk = download.read(CHUNK)
                  if not chunk:
                      break
                  f.write(chunk)
  
          print 'file saved at {0}'.format(filename)
  
subject: rename retreive_ncdc_gsod_files -> download_ncdc_gsod_files