Revision 3 as of 2006-11-28 18:01:35

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Possible Python 3K Class Tree?

This page contain an incomplete thinking-out-loud description of a re-factoring of the base and built-in Python types into a set of Abstract Base Classes (ABCs) and concrete types. This would probably be a good time to enumerate the exceptions various basic operations can raise, as well.

Some questions:

Comparable:
 is (other) => Boolean
 equals (other) => Boolean
 None

Boolean (Comparable):
 True
 False

Object (Comparable):
 hash () => Integer
 id () => Integer
 true () => Boolean

Orderable:
 less_than (Object) => Boolean
 greater_than (Object) => Boolean

Numeric:
 add (Numeric) => Numeric
 subtract (Numeric) => Numeric
 product (Numeric) => Numeric
 quotient (Numeric) => Numeric
 floored_quotient (Numeric) => Numeric
 remainder (Numeric) => Numeric
 negate (Numeric) => Numeric
 absolute_value () => Numeric
 exponentiate (Numeric) => Numeric
 magnitude () => Numeric

Integer (Object, Orderable, Numeric):
 or (Integer) => Integer
 xor (Integer) => Integer
 and (Integer) => Integer
 shift (Integer) => Integer
 invert (Integer) => Integer
 real () => Real

Real (Object, Orderable, Numeric):
 floor () => Integer
 ceiling () => Integer

Complex (Object, Orderable, Numeric):
 conjugate () => Complex

Iterable:
 iterator () => Iteration

Iteration (Object, Iterable):
 next () => other

# should Container be Iterable, or should that be reserved for real types, like Tuple?
Container (Iterable):
 len () => Integer
 contains (Object) => Boolean

Set (Container):
 is_subset (Set) => Boolean
 is_superset (Set) => Boolean
 union_with (Set) => Set
 intersection_with (Set) => Set
 difference (Set) => Set
 symmetric_difference (Set) => Set
 # should this be "multiply" to match Sequence?
 shallow_copy () => Set

Sequence (Container):
 # normal access via index
 slice1 (Integer) => Object
 # normal slice of range
 slice2 (Integer, Integer) => Sequence
 # slice with step K
 slice3 (Integer, Integer, Integer) => Sequence
 # return self + other Sequence
 concatenate (Sequence) => Sequence
 # N shallow copies of self
 multiply (Integer) => Sequence
 # do "min" and "max" make sense over arbitrary sequences?  Should really only apply to sequences of "Orderable"
 min () => Object
 max () => Object

MutableSequence (Sequence):
 append (Object) => self
 insert (Integer position, Object) => self
 # value at I is replaced with Object
 replace (Integer position, Object) => self
 # slice from I to J is replaced with values of Iterator
 replace2 (Integer start, Integer end, Iterable) => self
 # slice from I to J with step K is replaced by Iterator
 replace3 (Integer start, Integer end, Integer step, Iterable) => self
 extend (Object) => self
 count (Object) => Integer
 reverse ()
 index1 (Object) => Integer
 index2 (Object, Integer start, Integer end) => Object
 pop1 () => Object
 pop2 (Integer position) => Object
 delete1 (Integer position) => self
 delete2 (Integer start, Integer end) => self
 delete3 (Integer start, Integer end, Integer step) => self
 sort0 () => self
 sort1 (Function comparison_fn) => self
 sort2 (Function comparison_fn, Function key_fn) => self
 sort3 (Function comparison_fn, Function key_fn, Boolean reverse) => self

String (Object, Comparable, Sequence):
 TBD

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