python-crontab | Github mirror of python-crontab | Cron Utils library
kandi X-RAY | python-crontab Summary
kandi X-RAY | python-crontab Summary
Crontab module for read and writing crontab files and accessing the system cron automatically and simply using a direct API. Comparing the `below chart `_ you will note that W, L, # and ? symbols are not supported as they are not standard Linux or SystemV crontab format. ============= =========== ================= =================== ============= Field Name Mandatory Allowed Values Special Characters Extra Values ============= =========== ================= =================== ============= Minutes Yes 0-59 \* / , - < > Hours Yes 0-23 \* / , - < > Day of month Yes 1-31 \* / , - < > Month Yes 1-12 or JAN-DEC \* / , - < > Day of week Yes 0-6 or SUN-SAT \* / , - < > ============= =========== ================= =================== =============. Extra Values are '<' for minimum value, such as 0 for minutes or 1 for months. And '>' for maximum value, such as 23 for hours or 12 for months.
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Top functions reviewed by kandi - BETA
- Parse a cron range string
- Return a CronValue instance
- Resets the range of values
- Parse the value of the crontab
- Read crontab file
- Read lines from the file
- Append a cron
- Create a pipe with flags
- Run the next run
- Run the command
- Schedules the current slice
- Parse the value
- Return a new CronRange
- Return a list of comments
- Returns whether this CronSlices is valid
- Add new tabs
- Return the log for this program
- The authenticated user
- Generate a crontab
- Start time between two intervals
- Return a list of crons
- Return the user options
- Parse parts
- Parses a line
- Create a new job
- Return a list of CronTab objects
python-crontab Key Features
python-crontab Examples and Code Snippets
Community Discussions
Trending Discussions on python-crontab
QUESTION
I'm using a python script with python-crontab to generate job entries in the crontab, and execute them every minute.
I'm doing something like:
...ANSWER
Answered 2021-Feb-02 at 14:08This way, I'm redirecting both the stdout and stderr to the log_listener.txt file. Is it possible to split them, and send them to two different files?
Youre redirecting b oth to log_listener.txt because you specifically asked that stderr (2)'s output be redirected (>) to stdout (&1).
If that's not what you want, don't do that?
> f is a shortcut for 1>f which redirects output (>) from stdout (1) to the file f, truncating it if it exists.
2 is stderr, so you can just 2> to some other file in order to redirect stderr to a different file than stdout. >> is an appending redirection so 2>> will append stderr to an existing file (or create it) in the same way >> does for stdin.
Therefore you can just have a command of
QUESTION
Im trying to install airflow on Ubuntu.
I set up a virtualenv with python 3.5.3 and tried to install airflow this way :
...ANSWER
Answered 2020-Dec-01 at 14:26Use the following i.e. https://github.com/apache/airflow/blob/constraints-1.10.9/constraints-3.5.txt (Constraints file for Airflow 1.10.9 and Python 3.5):
QUESTION
TLDR: Using python, crontab.remove_all appears to be working, but when I instanciate a new crontab, I can see that the remove_all command didn't work.
Long question : I'm trying to use cronjobs in my project, but before that I want to be able to test them. As I don't want to have an infinity of jobs running, I need to first be able to delete them. However, it doesn't work as I thought it would.
Here is my code :
...ANSWER
Answered 2020-Nov-19 at 14:43crontab just interacts with the system's cron management. If you don't write the changes, they're not commmitted, so instantiating a new crontab object will read the existing stuff, not the "pending" work.
QUESTION
I am using python-crontab to build a Desktop notification system. However, I can not figure out how to schedule multiple scripts using python-crontab.
Here is what I have to schedule one script:
...ANSWER
Answered 2020-Aug-09 at 11:17See if this helps :
QUESTION
With my python script below, I wanted to check if a cron job is defined in my linux (centOS 7.5) server, and if it doesn't exist, I will add one by using python-crontab module.. It was working well until I gave CRONTAB -R to delete existing cron jobs and when I re-execute my python script, it is saying cronjob exists even after they were removed using crontab -r..
...ANSWER
Answered 2020-Jul-15 at 01:50The problem is that you have initialized a new Cron job before checking if it exists. You assumed that Cron.find_command() is only identifying enabled cron jobs. But it also identifies cronjobs that are created, but not enabled yet.
So, you have to check if the cronjob exists before creating a new job. Then, if it does not exist, you can create a new cron job and enable it. You can try the below code:
QUESTION
I create a docker image in order to set a python code with schedule,so I use python-crontab module, how can i solve permission denied problem?
Ubuntu 16.04.6 LTS python 3.5.2
I create sche.py and it can trigger weather.py,
it is success in local,but it can't package to docker image
ANSWER
Answered 2019-Jul-05 at 06:20Try USER root after FROM python:3.5.2 line.
Remove CMD ["sudo"] and ENTRYPOINT ["/weather"]
Replace RUN mkdir /usr/bin/crontab
QUESTION
I was reading python-crontab documentation and I could not find a way to schedule a job every day at a certain hour. I want to have something like this:
...ANSWER
Answered 2019-May-14 at 20:52It sounds like what you want is 0 17 * * *, which will run everyday at 17:00.
To achieve this you need to set the minute to 0:
QUESTION
I'm trying to deploy to elastic beanstalk a django project that uses celery periodic tasks, using SQS.
I've been more or less following the instructions here:
How to run a celery worker with Django app scalable by AWS Elastic Beanstalk?
When I deploy to eb, the periodic tasks are not being executed.
Checking the celery-beat log, everything seems right:
...ANSWER
Answered 2019-Jan-30 at 12:33when you do
QUESTION
Importing packages that are subsequently installed (not present by default in python distribution for rhel 7.6) not working when ran as cron job
Hi Team,
I have a python(2.7) script which imports paramiko package. The script can import the paramiko package successfully when ran as a user(root or ftpuser) after logging in but it cannot import it when ran from cron job. I have tried out various options as provided in the brilliant stack overflow pages like the below but unfortunately couldn't resolve the issue. 1) Crontab not running my python script
I have provided the path to the paramiko package and verified it is successfully received at the script end by logging it when run as cron job and also I have given chmod -R 777 permission to the paramiko folder in the /opt/rh/python27/root/usr/lib/python2.7/site-packages location. Still the import is not functioning when ran as cron job
I have created a shell script and tried to invoke python script from with in the script and configured the shell script in cron job but it seems python script was not invoked
I have verified that there is only one python installation present in the server and so I' am using the correct path
I have disabled selinux option and tried after rebooting but issue still persists
Please note the issue exists not for just paramiko package but for other packages as well that was installed subsequently like mysql.connector e t c
Update1It has to be something to do with the way I install the paramiko package because the script can even import other packages in the same path as that of paramiko and the permissions for both of them look identical only difference is former comes with the python distribution that is deployed from using the url https://access.redhat.com/solutions/1519803. Cannot figure out what is wrong with the installation steps as I install it as root after doing sudo su and then setting umask to 0022. I do pip install of parmiko and python-crontab as mentioned in their sites and both have the same issue
Another interesting thing is though I have the code to log exception around the failing import statement it never logs the exception but script seems to halt/hang at the import statment
Please help to resolve this issue...
PYTHON CODE ...ANSWER
Answered 2019-Jan-03 at 11:58This seems to be working now after adding one more environment variable to crontab as below
LD_LIBRARY_PATH=/opt/rh/python27/root/usr/lib64
QUESTION
I need to read the contents of the /etc/crontab file.
Right now I have this:
...ANSWER
Answered 2018-Dec-02 at 17:41croniter handles a single cron-expression. You should have it inside the loop, and apply it to each row individually:
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Install python-crontab
You can use python-crontab like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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