Comment #13 on issue 1919 by mattpap: unify behavior of var() and symbols()
http://code.google.com/p/sympy/issues/detail?id=1919
Did you give any consideration to the syntax var('a1:3') -> a1, a2, a3?
Yes:
In [1]: var('a0:3')
Out[1]: (a₀, a₁, a₂)
In [2]: var('a3:0')
Out[2]: ()
In [3]: var('a:f')
Out[3]: (a, b, c, d, e, f)
In [4]: var('f:a')
Out[4]: ()
Note that range syntax mimics Python's range(), so upper limit is excluded
from the resulting sequence. On the other hand, lexicographic syntax is
inclusive (this way it makes more sense).
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