Python 2.5b2 (r25b2:50512, Jul 11 2006, 10:16:14) [MSC v.1310 32 bit (Intel)] on win32
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IDLE 1.2b2      
>>> a='a string'
>>> b="""a
multiline
string
"""
>>> dir()
['__builtins__', '__doc__', '__name__', 'a', 'b']
>>> traceback

Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    traceback
NameError: name 'traceback' is not defined
>>>