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tuple    
元组

元组

tuple
有序n 元; n 重序元


tuple
n 倍; n 元组; n 元数; n 元向量


tuple
重元组

tuple
元

In {functional languages}, a data object containing two or
more components. Also known as a product type or pair,
triple, quad, etc. Tuples of different sizes have different
types, in contrast to lists where the type is independent of
the length. The components of a tuple may be of different
types whereas all elements of a list have the same type.
Examples of tuples in {Haskell} notation are (1,2),
("Tuple",True), (w,(x,y),z). The degenerate tuple with zero
components, written (), is known as the unit type since it has
only one possible value which is also written ().

The implementation of tuples in a language may be either
"{lifted}" or not. If tuples are lifted then (bottom,bottom)
/= bottom and the evaluation of a tuple may fail to terminate.
E.g. in Haskell:

f (x,y) = 1 --> f bottom = bottom
f (bottom,bottom) = 1

With lifted tuples, a tuple pattern is refutable. Thus in
Haskell, {pattern matching} on tuples is the same as pattern
matching on types with multiple constructors ({algebraic data
types}) - the expression being matched is evaluated as far as
the top level constructor, even though, in the case of tuples,
there is only one possible constructor for a given type.

If tuples are unlifted then (bottom, bottom) = bottom and
evaluation of a tuple will never fail to terminate though any
of the components may. E.g. in {Miranda}:

f (x,y) = 1 --> f bottom = 1
f (bottom,bottom) = 1

Thus in Miranda, any object whose type is compatible with a
tuple pattern is assumed to match at the top level without
evaluation - it is an {irrefutable} pattern. This also
applies to user defined data types with only one constructor.
In Haskell, patterns can be made irrefutable by adding a "~"
as in

f ~(x,y) = 1.

If tuple constructor functions were {strict} in all their
arguments then (bottom,x) = (x,bottom) = bottom for any x so
matching a refutable pattern would fail to terminate if any
component was bottom.


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  • python - What is a tuple useful for? - Stack Overflow
    1 A tuple is useful for storing multiple values As you note a tuple is just like a list that is immutable - e g once created you cannot add remove swap elements One benefit of being immutable is that because the tuple is fixed size it allows the run-time to perform certain optimizations
  • Whats the difference between lists and tuples? - Stack Overflow
    What are the differences between lists and tuples, and what are their respective advantages and disadvantages?
  • How does tuple comparison work in Python? - Stack Overflow
    The python 2 5 documentation explains it well Tuples and lists are compared lexicographically using comparison of corresponding elements This means that to compare equal, each element must compare equal and the two sequences must be of the same type and have the same length If not equal, the sequences are ordered the same as their first differing elements For example, cmp ( [1,2,x], [1,2,y
  • Type hinting tuples in Python - Stack Overflow
    def func(var: list[int]): # do something func([1]) # would be fine func([1, 2]) # would also be fine func([1, 2, 3]) # would also be fine That's consequentially, in a way, because of the type of tuples Because they are designed not to be changed, you have to hardcode the amount of items in it So my question is, is there a way to make the number of items in a tuple type hint flexible? I tried
  • types - What are named tuples in Python? - Stack Overflow
    Named tuples are basically easy-to-create, lightweight object types Named tuple instances can be referenced using object-like variable dereferencing or the standard tuple syntax They can be used similarly to struct or other common record types, except that they are immutable They were added in Python 2 6 and Python 3 0, although there is a recipe for implementation in Python 2 4 For
  • AttributeError: tuple object has no attribute - Stack Overflow
    This is what is called a tuple, obj is associated with 4 values, the values of s1,s2,s3,s4 So, use index as you use in a list to get the value you want, in order
  • How to create tuple with a loop in python - Stack Overflow
    3 A tuple is an immutable list This means that, once you create a tuple, it cannot be modified Read more about tuples and other sequential data types here
  • c# - How to name tuple properties? - Stack Overflow
    How and "could be" organized return from the method which returns tuple type with the name of parameters, as an example private static Tuple lt;string, string gt; methodTuple() { return new {N
  • c# - Tuple. Create () vs new Tuple - Stack Overflow
    new Tuple<int,int>(1,2); Tuple Create(1,2); Is there any difference between these two methods of Tuple creation? From my reading it seems to be more a convenient shorthand than anything like object creation in C++ (heap vs stack)





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