Python3 script in crontab in ubuntu

Question

eric@eric:~/project$ tree -d
.
|-- env
|   |-- bin
|   |-- include
|   |   `-- python3.4m -> /usr/include/python3.4m
|   `-- lib
|       `-- python3.4
|           |-- collections -> /usr/lib/python3.4/collections
|           |-- config-3.4dm-x86_64-linux-gnu -> /usr/lib/python3.4/config-3.4dm-x86_64-linux-gnu
|           |-- config-3.4m-x86_64-linux-gnu -> /usr/lib/python3.4/config-3.4m-x86_64-linux-gnu
|           |-- distutils
|           |   `-- __pycache__
|           |-- encodings -> /usr/lib/python3.4/encodings
|           |-- importlib -> /usr/lib/python3.4/importlib
|           |-- lib-dynload -> /usr/lib/python3.4/lib-dynload
|           |-- plat-x86_64-linux-gnu -> /usr/lib/python3.4/plat-x86_64-linux-gnu
|           |-- __pycache__
|           `-- site-packages
|               ...  # removed thirdparty libraries just to make it more readable
|               |-- pip-1.5.6.dist-info
|               |-- __pycache__
|               |-- setuptools
|               |   |-- command
|               |   |   `-- __pycache__
|               |   |-- __pycache__
|               |   `-- tests
|               |       `-- __pycache__
|               `-- setuptools-3.6.dist-info
`-- myscript.py

so in home directory there is a folder named project. in project folder I have a virtualenv folder and a simple script(let's say hello world in python3)

which python3 gives /usr/bin/python3

Now I'm trying to run this script using crontab -e (ubuntu 14.04). I can run this script manually by activating virtualenv (source env/bin/activate) but I've no idea how should I do this thing in crontab and what would be the shebang for this python3 virtualenv.

PS: I'm able to run a python2 script in crontab by adding this shebang #!/usr/bin/python at top of the file and then this line in crontab -e (run everyday at 2PM )

00 14 * * * /usr/bin/python /home/eric/project/myscript.py >> /var/log/cronjob.log

PPS: I dont want to write setup.py and use setuptools just a natural way (as I did above for python2)

what is python3 specific about it? have you tried the obvious /path/to/env/bin/python /path/to/script.py ...? — jfs
– jfs, Commented Feb 28, 2015 at 21:19

Oleksii M · Accepted Answer · 2015-02-28 21:27:12Z

1

If I understood right, you want to run your script with python3 from virtualenv.

If so, you should use this path in your crontab -e: /home/eric/project/env/bin/python (figure out the exact path, if this one doesn't work).

I think, shebang has no nothing to do here, once you specify python binary explicitly.

answered Feb 28, 2015 at 21:27

Oleksii M

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