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Thefollowingsectionsdescribethestandardtypesthatarebuiltintotheinterpreter.Theprincipalbuilt-intypesarenumerics,sequences,mappings,classes,instancesandexceptions.Somecollectionclassesaremutable.Themethodsthatadd,subtract,orrearrangetheirmembersinplace,anddon’treturnaspecificitem,neverreturnthecollectioninstanceitselfbutNone.Someoperationsaresupportedbyseveralobjecttypes;inparticular,practicallyallobjectscanbecomparedforequality,testedfortruthvalue,andconvertedtoastring(withtherepr()[1]functi...
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The following sections describe the standard types that are built into the interpreter.
The principal built-in types are numerics, sequences, mappings, classes, instances and exceptions.
Some collection classes are mutable. The methods that add, subtract, or rearrange their members in place, and don’t return a specific item, never return the collection instance itself but None.
Some operations are supported by several object types; in particular, practically all objects can be compared for equality, tested for truth value, and converted to a string (with the repr()[1] function or the slightly different str()[2] function). The latter function is implicitly used when an object is written by the print()[3] function.
Truth Value TestingAny object can be tested for truth value, for use in an if or while[4] condition or as operand of the Boolean operations below.
By default, an object is considered true unless i...
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