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delattr(__builtins__,"getattr") causes shell to stop working
if you type some code in nothing gets printed back
if you press enter without typing any code you get a traceback
Exception in thread SockThread:
Traceback (most recent call last):
 File "/usr/lib/python3.2/socketserver.py", line 284, in _handle_request_noblock
 self.process_request(request, client_address)
 File "/usr/lib/python3.2/socketserver.py", line 310, in process_request
 self.finish_request(request, client_address)
 File "/usr/lib/python3.2/socketserver.py", line 323, in finish_request
 self.RequestHandlerClass(request, client_address, self)
 File "/usr/lib/python3.2/idlelib/rpc.py", line 503, in __init__
 socketserver.BaseRequestHandler.__init__(self, sock, addr, svr)
 File "/usr/lib/python3.2/socketserver.py", line 637, in __init__
 self.handle()
 File "/usr/lib/python3.2/idlelib/run.py", line 264, in handle
 rpc.RPCHandler.getresponse(self, myseq=None, wait=0.05)
 File "/usr/lib/python3.2/idlelib/rpc.py", line 280, in getresponse
 response = self._getresponse(myseq, wait)
 File "/usr/lib/python3.2/idlelib/rpc.py", line 300, in _getresponse
 response = self.pollresponse(myseq, wait)
 File "/usr/lib/python3.2/idlelib/rpc.py", line 438, in pollresponse
 response = self.localcall(seq, resq)
 File "/usr/lib/python3.2/idlelib/rpc.py", line 185, in localcall
 method = getattr(obj, methodname)
NameError: global name 'getattr' is not defined
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/usr/lib/python3.2/threading.py", line 740, in _bootstrap_inner
 self.run()
 File "/usr/lib/python3.2/threading.py", line 693, in run
 self._target(*self._args, **self._kwargs)
 File "/usr/lib/python3.2/idlelib/run.py", line 135, in manage_socket
 server.handle_request() # A single request only
 File "/usr/lib/python3.2/socketserver.py", line 269, in handle_request
 self._handle_request_noblock()
 File "/usr/lib/python3.2/socketserver.py", line 286, in _handle_request_noblock
 self.handle_error(request, client_address)
 File "/usr/lib/python3.2/idlelib/run.py", line 240, in handle_error
 print('Request: ', repr(request), file=erf)
 File "/usr/lib/python3.2/socket.py", line 111, in __repr__
 getattr(self, '_closed', False) and " [closed] " or "",
NameError: global name 'getattr' is not defined

Running the delattr(__builtins__,"getattr") in Python from the cmd line doesn't create any problems though.

Another note: this bug is reproducable in the IDLE Shell with the python subprocess feature enabled (the python process that runs your commands and the python process that manages IDLE's windows are different).

Why do you think this is a bug? It is expected behavior.

IDLE should try to mimic Python as much as feasible.

s/Python/Python in cmd

Well, I don't think that imitating the command line needs to extend to supporting doing unusual things to builtins, so unless someone like Terry disagrees I think we should close this as won't fix.

I'm afraid it's not feasible. Python (or IDLE) is allowed to rely on Python working correctly, and if commonly used functions are modified there will be unexpected errors.
Likewise in 3.3, after a "del __builtins__.hasattr", even import statements will fail...

To put it another way, IDLE is written for standard Python. A standard Python interpreter has a getattr builtin that works as documented in the library manual. Deleting that or any other builtin makes the interpreter non-standard. So would replacing or wrapping the builtin with a function that does anything other than innocuously augmenting the behavior with something like counting calls or logging them to a file.
Deletion of getattr *does* create problems for CPython (or any interpreter) in that legal Python code using getattr no longer runs. I presume CPython can limp along and execute other code because it directly calls the C function wrapped by the __builtins__.getattr object.