Removed some extraneous and confusing parenthesized expressions.
Noted by Skip Montanaro <skip@mojam.com>.
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@ -840,15 +840,15 @@ def make_incrementor(increment):
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expression_list: expression ("," expression)* [","]
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\end{verbatim}
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An expression (expression) list containing at least one comma yields a
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An expression list containing at least one comma yields a
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tuple. The length of the tuple is the number of expressions in the
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list. The expressions are evaluated from left to right.
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\obindex{tuple}
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The trailing comma is required only to create a single tuple (a.k.a. a
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\emph{singleton}); it is optional in all other cases. A single
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expression (expression) without a trailing comma doesn't create a
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tuple, but rather yields the value of that expression (expression).
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expression without a trailing comma doesn't create a
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tuple, but rather yields the value of that expression.
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(To create an empty tuple, use an empty pair of parentheses:
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\code{()}.)
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\indexii{trailing}{comma}
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