cmd = ["xzcat",'-dk', '-T 20',input_filename]
elif re.match(r'.*\.zst',input_filename):
cmd = ['zstd','-dck', input_filename]
+ elif re.match(r'.*\.gz',input_filename):
+ cmd = ['gzip','-dc', input_filename]
try:
input_file = Popen(cmd, stdout=PIPE).stdout
except NameError as e: