In https://github.com/sympy/sympy/pull/1738 there is work and discussion
related to how symbols might recognize multiple ranges like
>>> symbols('a:b2:4') # desired to give a2, a3, b2, b3
(a:b2, a:b3)
Although that one is unambigous, there is the question of how to delimit
contiguous numeric ranges like 1:31:4.
To recognize multiple ranges is already going to break compatibility since,
as the above example shows, recognizing more than one range will give a
different output. So two quesions:
1) should we do this or leave fancy symbol making to the user via
[Symbol(%s) % names]?
2) if we break backwards compatibility, how should ranges be delimited?
Options considered so far
a) parentheses with doubled parentheses used to indicate literal, e.g.
x(1:3) -> x1, x2 while x((1:3)) -> x(1), x(2)
b) a backslash e.g. x1:3\\3:4 -> x13, x23
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