title: UnicodeDecodeError utf-8 can't decode byte
body: <p>combined_csv = pd.concat([pd.read_csv(f) for f in all_filenames]) is not working showing </p>
  
  <p>UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 12: invalid start byte</p>
  
  <p>entire code below:</p>
  
  <pre><code>import os
  import glob
  import pandas as pd
  os.chdir("S/Last Processed Data")
  
  extension = 'csv'
  all_filenames = [i for i in glob.glob('*.{}'.format(extension))]
  
  combined_csv = pd.concat([pd.read_csv(f) for f in all_filenames])
  
  combined_csv.to_csv( "combined_csv.csv", index=False, encoding='utf-8-sig')
  </code></pre>