code: def cat_files(infiles, outfile):
      '''Cats all files in list infiles into outfile'''
      f_out = pyfastaq.utils.open_file_write(outfile)
  
      for filename in infiles:
          if os.path.exists(filename):
              f_in = pyfastaq.utils.open_file_read(filename)
              for line in f_in:
                  print(line, end='', file=f_out)
              pyfastaq.utils.close(f_in)
  
      pyfastaq.utils.close(f_outf cat_files(infiles, outfile):
      '''Cats all files in list infiles into outfile'''
      f_out = pyfastaq.utils.open_file_write(outfile)
  
      for filename in infiles:
          if os.path.exists(filename):
              f_in = pyfastaq.utils.open_file_read(filename)
              for line in f_in:
                  print(line, end='', file=f_out)
              pyfastaq.utils.close(f_in)
  
      pyfastaq.utils.close(f_out)
docs: Cats all files in list infiles into outfile