cpython/Include/rangeobject.h

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/* Range object interface */

/*
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rangeobject represents an integer range.  This is an immutable object;
a range cannot change its value after creation.

Range objects behave like the corresponding tuple objects except that
they are represented by a start, stop, and step datamembers.
*/

extern DL_IMPORT typeobject Rangetype;

#define is_rangeobject(op) ((op)->ob_type == &Rangetype)

extern object *newrangeobject PROTO((long, long, long, int));