Does this make sense?
>>> symbols('x:c') # or should it require a delimiter 'x\\:c' or 'x(:c)'
(xa, xb, xc)
>>> symbols('x:z')
(x, y, z)
(Or should the first case give no symbols as it presently does?)
In favor of using parentheses around ranges, they help to visually
make clear what is intended, e.g 'x(:c)', and they are consistent with
the use of redundant parentheses in expressions (logical or algebraic)
to make parsing more obvious.
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