I am trying to embed a \"live\" spreadsheet in a django template via an iframe containing a Google Doc spreadsheet. I want the spreadsheet to be editable from the web page where
The problem is that the "publish to web" in Google Docs gives you a non-editable version of the spreadsheet. (So this is not really a django problem.)
You will need to do "share", select in "Who has access" that "Anyone with a link" does, and select that Anyone with no sign-in can edit. Then use the sharing link as the src= value.