I am running Raspbian Stretch and have a python 3 script that executes correctly when I am in the relevant directory and input it in the command line as:
sudo python3 Example.py
The shebang #! line is in the script as follows:
#!/usr/bin/env python3
And made the script executable with:
sudo chmod +x Example.py
I've tried several variation of below within crontab -e to no avail
10 * * * * python3 /home/pi/Desktop/Example.py