I installed the python3 and configure the virtual environment, a virtual environment installed some third-party libraries, I wrote a sh scripts, performed manually programs can be executed, after joining crontab hint I can't find a custom module, should be a path problem, but I don't know where is wrong?
To give directions, thank you!

 
#!/bin/bash 
Export PYTHONPATH=$PYTHONPATH 
CD/usr/local/python3/bin/ENV/
Source./bin/activate 
CD/root/pythonproject/History 
Python3 Mod/crontabtest py 
Deactivate 

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someone,,,,,,,,,,,