export ASCEND_TOOLKIT_HOME=/usr/local/Ascend/ascend-toolkit/latest
export LD_LIBRARY_PATH=${ASCEND_TOOLKIT_HOME}/lib64:${ASCEND_TOOLKIT_HOME}/lib64/plugin/opskernel:${ASCEND_TOOLKIT_HOME}/lib64/plugin/nnengine:$LD_LIBRARY_PATH
export PYTHONPATH=${ASCEND_TOOLKIT_HOME}/python/site-packages:${ASCEND_TOOLKIT_HOME}/opp/built-in/op_impl/ai_core/tbe:$PYTHONPATH
export PATH=${ASCEND_TOOLKIT_HOME}/bin:${ASCEND_TOOLKIT_HOME}/compiler/ccec_compiler/bin:$PATH
export ASCEND_AICPU_PATH=${ASCEND_TOOLKIT_HOME}
export ASCEND_OPP_PATH=${ASCEND_TOOLKIT_HOME}/opp
export TOOLCHAIN_HOME=${ASCEND_TOOLKIT_HOME}/toolkit
export ASCEND_HOME_PATH=${ASCEND_TOOLKIT_HOME}

python代码：

import acl

# 1. 初始化 ACL
acl.init()

# 2. 获取设备数量
device_count = acl.rt.get_device_count()[0]
print("Number of NPU devices:", device_count)

acl.finalize()

参考文档：

https://support.huawei.com/enterprisesearch/#/index?keyword=aclrtGetDeviceCount&lang=zh&searchModelType=30&searchType=searchAll&site=0&sortType=Relevance&pageSize=20&start=1&ebgSearchFlag=true