Is Python a

Such operations are convenient when dealing with large data sets; the intersection oftwo sets contains objects in common to both, for example, and the union containsall items in either set. Here’s a more realistic example of set operations at work,applied to lists of people in a hypothetical company:>>> engineers = set(['bob', 'sue', 'ann', 'vic'])>>> managers = set(['tom', 'sue'])>>>>>> engineers & managers # Who is both engineer and manager?set(['sue'])>>>>>> engineers | managers # All people in either categoryset(['vic', 'sue', 'tom', 'bob', 'ann'])>>>>>> engineers – managers # Engineers who are not managersset(['vic', 'bob', 'ann'])In addition, the set object provides method calls that implement more exotic setoperations. Although set operations can be coded manually in Python (and oftenwere in the past), Python’s built-in sets use efficient algorithms and implementationtechniques to provide quick and standard operation.For more details on sets, see Python’s library reference manual.BooleansIn Python 3.0, the literal notation {1, 2, 3} is proposed to have thesame effect as the current call set([1, 2, 3]), and will thus be anotherway to create a set object. This is a future extension, so see the 3.0release notes for details.Some argue that the Python Boolean type, bool, is numeric in nature because its twovalues, True and False, are just customized versions of the integers 1 and 0 that printthemselves differently. Although that’s all most programmers need to know, let’sexplore this type in a bit more detail.Python 2.3 introduced a new explicit Boolean data type called bool, with the valuesTrue and False available as new preassigned built-in names. Internally, the newnames True and False are instances of bool, which is in turn just a subclass (in theobject-oriented sense) of the built-in integer type int. True and False behave exactlylike the integers 1 and 0, except that they have customized printing logic—they printthemselves as the words True and False, instead of the digits 1 and 0 (technically,bool redefines its str and repr string formats). ** Some argue that the Python Boolean type, bool, is numeric in nature because its two values, True and False,are just customized versions of the integers 1 and 0 (they simply display themselves differently whenprinted). For most practical purposes, this is all you’ll need to know about Booleans.Other Numeric Types | 109