cmd activates the anaconda environment and runs .py

C:\WINDOWS\system32>conda info --envs
WARNING: The conda.compat module is deprecated and will be removed in a future release.
# conda environments:
#
base                  *  D:\huxiao\ananconda
p37y                     D:\huxiao\ananconda\envs\p37y
paddle_env               D:\huxiao\ananconda\envs\paddle_env
pytorch                  D:\huxiao\ananconda\envs\pytorch
tensorflow               D:\huxiao\ananconda\envs\tensorflow
vrep                     D:\huxiao\ananconda\envs\vrep


C:\WINDOWS\system32>activate pytorch

(pytorch) C:\WINDOWS\system32>python "D:\桌面\机器学习\pytorch\cnn.py"

Then you can run