Create scheduled tasks at runtime easily.
pip install python-scheduler
from pyscheduler import schedule # crawl_task runs in every 2 minutes @schedule('*/2 * * * *') def crawl_task(): print 'crawl task'
It won't definitely create any cronjob on the os level. All tasks will be executed on runtime.
Every cron syntax can be used.
Concurrency are not considered during development. That's why, it is so lightweight library for single process applications for now.