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Running:
Python 2.7.2 (default, Jun 12 2011, 14:24:46) [MSC v.1500 64 bit (AMD64)]
Code:
import copy
copy.copy(iter([1,2,3]))
Exception:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
T:\languages\Python27\Scripts\<ipython-input-2-4b0069a09ded> in <module>()
----> 1 copy.copy(iter([1,2,3]))
T:\languages\Python27\lib\copy.pyc in copy(x)
 94 raise Error("un(shallow)copyable object of type %s" % cl
s)
 95
---> 96 return _reconstruct(x, rv, 0)
 97
 98
T:\languages\Python27\lib\copy.pyc in _reconstruct(x, info, deep, memo)
 327 if deep:
 328 args = deepcopy(args, memo)
--> 329 y = callable(*args)
 330 memo[id(x)] = y
 331
T:\languages\Python27\lib\copy_reg.pyc in __newobj__(cls, *args)
 91
 92 def __newobj__(cls, *args):
---> 93 return cls.__new__(cls, *args)
 94
 95 def _slotnames(cls):
TypeError: object.__new__(listiterator) is not safe, use listiterator.__new__()
Either this is a bug or not a clear error message in the exception