python-crontab | Crontab module for reading and writing crontab files | Cron Utils library
kandi X-RAY | python-crontab Summary
kandi X-RAY | python-crontab Summary
Crontab module for reading 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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QUESTION
I'm building a web app where I have a calendar where users can choose a day and an hour in the future and schedule tasks. The scheduled task is a simple function in python to be called on the exact date and time the user has chosen to.
I came across the schedule package but I rapidly understood that it wasn't suitable for my goal as they explicitly stated that it shouldn't be used if you need job persistence and localization, which I definitely need.
Because of my need, I think I'll need to use some sort of OS cron such as the crontab on Linux. The issue is that I do not need to have my function execute every given time interval but only at a given time chosen by the user.
Is there any other solution than crontab? I've seen the python-crontab package but it seems able to execute commands and not really function directly on a Python file.
Any thoughts?
PS I'm using Django and I've already seen the django-crontab package but it seems too static to me as I need to have dynamic cron jobs to add/remove
...ANSWER
Answered 2022-Mar-15 at 20:28So, in the end, my solution was to use python-crontab as below:
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:
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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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