old_contents: import os
  import sys
  
  from glob import glob
  import pandas as pd
  
  
  DATABASE_NAME = "mimic4.db"
  THRESHOLD_SIZE = 5 * 10 ** 7
  CHUNKSIZE = 10 ** 6
  CONNECTION_STRING = "sqlite:///{}".format(DATABASE_NAME)
  
  if os.path.exists(DATABASE_NAME):
      msg = "File {} already exists.".format(DATABASE_NAME)
      print(msg)
      sys.exit()
  
  for f in glob("**/*.csv.gz",recursive=True):
      print("Starting processing {}".format(f))
      folder,filename = os.path.split(f)
      tablename = filename.strip(".csv.gz").lower()
      if os.path.getsize(f) < THRESHOLD_SIZE:
          df = pd.read_csv(f)
          df.to_sql(tablename, CONNECTION_STRING)
      else:
          # If the file is too large, let's do the work in chunks
          for chunk in pd.read_csv(f, chunksize=CHUNKSIZE, low_memory=False):
              chunk.to_sql(
                  tablename, CONNECTION_STRING, if_exists="append"
              )
      print("Finished processing {}".format(f))
  
  print("Should be all done!")
  
new_contents: import os
  import sys
  
  from glob import glob
  import pandas as pd
  
  DATABASE_NAME = "mimic4.db"
  THRESHOLD_SIZE = 5 * 10**7
  CHUNKSIZE = 10**6
  CONNECTION_STRING = "sqlite:///{}".format(DATABASE_NAME)
  
  if os.path.exists(DATABASE_NAME):
      msg = "File {} already exists.".format(DATABASE_NAME)
      print(msg)
      sys.exit()
  
  for f in glob("**/*.csv.gz", recursive=True):
      print("Starting processing {}".format(f))
      folder, filename = os.path.split(f)
      tablename = filename.strip(".csv.gz").lower()
      if os.path.getsize(f) < THRESHOLD_SIZE:
          df = pd.read_csv(f)
          df.to_sql(tablename, CONNECTION_STRING)
      else:
          # If the file is too large, let's do the work in chunks
          for chunk in pd.read_csv(f, chunksize=CHUNKSIZE, low_memory=False):
              chunk.to_sql(tablename, CONNECTION_STRING, if_exists="append")
      print("Finished processing {}".format(f))
  
  print("Should be all done!")
  
subject: reformat using yapf