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2 changes: 1 addition & 1 deletion Doc/reference/expressions.rst
Original file line number Diff line number Diff line change
Expand Up @@ -581,7 +581,7 @@ whose value is one of the keys of the mapping, and the subscription selects the
value in the mapping that corresponds to that key. (The expression list is a
tuple except if it has exactly one item.)

If the primary is a sequence, the expression (list) must evaluate to a plain
If the primary is a sequence, the expression list must evaluate to a plain
integer. If this value is negative, the length of the sequence is added to it
(so that, e.g., ``x[-1]`` selects the last item of ``x``.) The resulting value
must be a nonnegative integer less than the number of items in the sequence, and
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