>>> x = 'car'
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
AttributeError: 'str' object has no attribute 'close'
As tony mention str has no close() method as a file object.
cStringIO module has close(),or maybe you are trying to use close on what you think is a file object.
You can check type like this.
>>> x = 'car'
>>> from cStringIO import StringIO
>>> output = StringIO()
>>> output.write('This goes into the buffer.\n')
>>> print output.getvalue()
This goes into the buffer.
>>> output.close() # discard buffer memory
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