$ python
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> img = cStringIO.StringIO(open('st.jpg', 'rb').read())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'cStringIO' is not defined
>>> import cStringIO
>>> img = cStringIO.StringIO(open('st.jpg', 'rb').read())
>>> img2 = cStringIO.StringIO(open('st.jpg', 'rb').read())
>>> if img == img2
  File "<stdin>", line 1
    if img == img2
                 ^
SyntaxError: invalid syntax
>>> if img.getvalue() == img2.getvalue()
  File "<stdin>", line 1
    if img.getvalue() == img2.getvalue()
                                       ^
SyntaxError: invalid syntax
>>>