How to deregister a CRON job in AppEngine?

I registered a cron job in the google appengine. It runs fine. Since开发者_如何学编程 I deleted the whole content of the app, I want this job to not run anymore. I don't know how to do it.

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In Python, to delete all cron jobs, change the cron.yaml file to just contain:

cron:

In Java, to delete all cron jobs, change the cron.xml file to just contain:

<?xml version="1.0" encoding="UTF-8"?> 
<cronentries/>