when make receive some problome

[tower111]

GEN i386-softmmu/config-devices.mak GEN arm-softmmu/config-devices.mak GEN mips-softmmu/config-devices.mak GEN config-all-devices.mak Building Sleuthkit, please wait... GEN Sleuthkit PREP Sleuthkit headers/libs GEN config-host.h GEN trace.h GEN qemu-options.def GEN qmp-commands.h File "/home/tower/DECAF/decaf/scripts/qapi-commands.py", line 376 except getopt.GetoptError, err: ^ SyntaxError: invalid syntax Makefile:214: recipe for target 'qmp-commands.h' failed make: *** [qmp-commands.h] Error 1

when i use python3 can receive these problome. I resolve it when use python2 then run make (run make in conda virtual env)