new_contents: # -*- coding: utf-8 -*-
  
  import glob, os, sys
  import pandas as pd
  d = '/home/tvl/dev/scrapy-soccerway/soccerway/data/h/'
  frames = []
  os.chdir(d)
  print('Read csv files:')
  for f in glob.glob("matches*.csv"):
          print(f)
          frames.append(pd.read_csv(d+f))
  df = pd.concat(frames)
  df.set_index('id', inplace=True)
  df.sort_values(by='datetime', inplace=True)
  print('Totals:')
  print(df.count())
  df.to_csv(d+'historical2010-2120.csv', sep=',', encoding='utf-8')
  print('Dataframe size (bytes): {}'.format(sys.getsizeof(df)))
  
subject: Concatenate historical matches csv files