Start the AppRTC server this error found

[prashantkyada]

/google_appengine/dev_appserver.py --host 0.0.0.0 --enable_host_checking=no apprtc/src/app_engine/ --skip_sdk_update_check&

But some error found any solution.?
Traceback (most recent call last):
File "/google_appengine/dev_appserver.py", line 95, in
assert sys.version_info[0] == 2
AssertionError