指导里所用python build.py BearPi-HM_Nano编译，报错，应该用哪个命令？
bearpi@bearpi-virtual-machine:~/project/bearpi-hm_nano$ python build.py BearPi-HM_Nano
[Errno 13] Permission denied: '/home/bearpi/project/bearpi-hm_nano/out/BearPi-HM_Nano'
usage:
python build.py ipcamera_hi3516dv300
python build.py ipcamera_hi3518ev300
python build.py wifiiot
positional arguments:
product Name of the product
optional arguments:
-h, --help show this help message and exit
-b BUILD_TYPE, --build_type BUILD_TYPE
release or debug version.
-t [TEST [TEST ...]], --test [TEST [TEST ...]]
Compile test suit
-n, --ndk Compile ndk
