当脚本作为cronjob运行时，python脚本在import语句处停止 [英] python script stops at import statement when script is run as cronjob

问题描述

我每30分钟用cron执行一次python脚本，但是它在import语句处停止，我不明白为什么，因为我没有得到任何反馈。

I'm executing a python script every 30 minutes with cron, but it stops at the import statement and I don't understand why because I don't get any feedback.

在我的crontab中，我有 * / 30 * * * * sh exec_script.sh

In my crontab I have */30 * * * * sh exec_script.sh

文件 exec_script.sh 是

cd /home/ziofil/python_scripts
python script_30_mins.py

在python脚本中，我有

In the python script I have

import logging
logging.basicConfig(filename="explicit_log.txt",level=logging.DEBUG)
logger = logging.getLogger(__name__)

logger.debug("script is executed")

# in the python_scripts folder there is a subfolder utilities/ that
# contains utility_1.py, were I define the class Utility
from utilities.utility_1 import Utility
logger.debug("Utility loaded")

utility = Utility()
logger.debug("object creation")

utility.do_your_thing()
logger.debug("done its thing")

如果我执行 python script_30_minutes.py ，一切正常，但使用cron时，执行将在 import 语句处停止（我读到脚本已执行，但要注意）。

If I execute python script_30_minutes.py from the terminal, everything works just fine, but with cron the execution stops at the import statement (I read "script is executed", but noting else).

出了什么问题？

更新：我将import语句放在中try / except 块，它记录了异常：没有名为Utility.utility_1的模块。我还尝试将Shell脚本中的PYTHONPATH变量设置为 / home / ziofil / python_scripts ，但仍然无法正常工作。

UPDATE: I put the import statement in a try/except block and it logged the exception: "No module named utilities.utility_1". I also tried to set the PYTHONPATH variable in the shell script to /home/ziofil/python_scripts, but it still doesn't work.

推荐答案

我发现了问题所在。 @UweMannl一直都是对的。 @mhawke指出cron的环境不同于我的终端环境后，我认为也许python二进制也可能有所不同，的确是：我想要 / home / ziofil / anaconda3 / bin / python 和cron正在使用 / usr / bin / python 。

I found out what the problem was. @UweMannl was right all along. After @mhawke pointed out that cron's environment is different than the one of my terminal, I thought that perhaps also the python binary could be different and indeed it was: I want /home/ziofil/anaconda3/bin/python and cron was using /usr/bin/python.

我修改了脚本的最后一行到 / home / ziofil / anaconda3 / bin / python script_30_mins.py ，一切正常！

I modified the last line of the script to /home/ziofil/anaconda3/bin/python script_30_mins.py and everything works!

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