isign -o sample.ipa my.ipa error

[ncc0706]

python version: Python 3.7.3

[node@manjaro .isign]$ isign -o sample.ipa my.ipa
  File "/usr/bin/isign", line 141
    print json.dumps(bundle_info, indent=4, separators=(',', ': '))
             ^
SyntaxError: invalid syntax