I'm not too sure whether this works: def cbTable(rows): dlist = [] mt = sqlreflector.SQLReflector(dbpool, [commentRow]) if rows: for r in rows: d = mt.deleteRow(c) d.addCallback(cbDelete) d.addErrback(ebDelete) dlist.append(d) else: d = delete() dlist.append(d) dl = defer.DeferredList(dlist) return dl Liming Tsai Li Ming wrote:

How do I chain a deferred object with multiple deferred objects within a single function call?

I'm trying to wait for all the deferred to fire before triggering the foo function. How can I chain up the multiple deferreds in the FOR loop?

for k in keys: where = [("pk_col",reflector.EQUAL,k)] d = mt.loadObjectsFrom("table",whereClause=where) d.addCallback(cbTable) d.addErrback(ebTable) defer_list.append(d)

dl = defer.DeferredList(defer_list) dl.addCallback(foo)

def foo(result): print result reactor.stop()

def cbTable(rows):

mt = sqlreflector.SQLReflector(dbpool, [commentRow]) if rows: for r in rows: d = mt.deleteRow(c) d.addCallback(cbDelete) d.addErrback(ebDelete) else: d = delete()

return d

def cbDelete(result): d = delete() # Returns a deferred return d

Thanks, Liming