is there a way to download my application code from GAE

I accidently deleted my application code from my own machin开发者_Python百科e, however it's running on Google App Engine (GAE), is there a way I could download it from there?

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app engine actually recently added the ability for the developer who uploaded a given app version to download its source code:

http://code.google.com/appengine/docs/python/tools/uploadinganapp.html#Downloading_Source_Code

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You cannot do this unless you have prepared your app ahead of time properly. There is a chance the trick described by Nick in the duplicate question here might work for you. Otherwise, I would suggest using source control like git or svn.