Crontab 无法运行 python 脚本（手动运行良好）

Question

I am in the learning phase of ubuntu server. I have a python script that texts me the weather each morning, that script works perfectly when I run it from the command line. However when I try to set up a crontab entry, it does not work. The following line is what I put into my crontab file:

30 11 * * * cd /home/ubuntu/documents && /usr/bin/python /home/ubuntu/documents/weatherText.py

I also tried the following:

30 11 * * * /usr/bin/python /home/ubuntu/documents/weatherText.py

When I type either of the following commands into the terminal, my python script works great.

1.) cd /home/ubuntu/documents && /usr/bin/python /home/ubuntu/documents/weatherText.py
2.) /usr/bin/python /home/ubuntu/documents/weatherText.py

It has to be a problem with cron, right? Thanks for your time if you are viewing this now.

Edit: Here is the system log cron entries:

Answer 1

To know what is the problem exactly, write your commands in a .sh

In you case:

myscript.sh

#!/bin/bash
set -x
cd /home/ubuntu/documents
/usr/bin/python /home/ubuntu/documents/weatherText.py

With set -x all commands are printed in console.

and then execute your script with cron:

30 11 * * * /fullpathscript/myscript.sh > /anypath/cronlog.log 2>&1

where /anypath/cronlog.log will be created automatically. this log show you what is the exactly error of your logic of script.