Comment #1 on issue 1581 by gabrielgellner: subs(dict()) sometimes breaks
http://code.google.com/p/sympy/issues/detail?id=1581
To clarify the example
In[1]: N = sympy.Symbol('N')
In[2]: (1 + N).subs(dict(N=3))
causes the above error but
In[3]: (1 + N).subs({N: 3})
works.
whereas the original example is trying to substitute 3 for 3 which is not
quite as
informative.
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