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it refers to a named keyword argument. If the numerical arg_names in a format string
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are 0, 1, 2, ... in sequence, they can all be omitted (not just some)
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and the numbers 0, 1, 2, ... will be automatically inserted in that order.
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The *arg_name* can be followed by any number of index or
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attribute expressions. An expression of the form ``'.name'`` selects the named
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attribute using :func:`getattr`, while an expression of the form ``'[index]'``