Unlike sets, lists typically allow duplicate elements. More formally, lists typically allow pairs of elements e1 and e2 such that e1.equals(e2), and they typically allow multiple null elements if they allow null elements at all. It is not inconceivable that someone might wish to implement a list that prohibits duplicates, by throwing runtime exceptions when the user attempts to insert them, but we expect this usage to be rare. The List interface places additional stipulations, beyond those specified in the Collection interface, on the contracts of the iterator, add, remove, equals, and hashCode methods. Declarations for other inherited methods are also included here for convenience. The List interface provides four methods for positional (indexed) access to list elements. Lists (like Java arrays) are zero based. Note that these operations may execute in time proportional to the index value for some implementations (the LinkedList class, for example). Thus, iterating over the elements in a list is typically preferable to indexing through it if the caller does not know the implementation. The List interface provides a special iterator, called a ListIterator, that allows element insertion and replacement, and bidirectional access in addition to the normal operations that the Iterator interface provides. A method is provided to obtain a list iterator that starts at a specified position in the list. The List interface provides two methods to search for a specified object. From a performance standpoint, these methods should be used with caution. In many implementations they will perform costly linear searches. The List interface provides two methods to efficiently insert and remove multiple elements at an arbitrary point in the list. Note: While it is permissible for lists to contain themselves as elements, extreme caution is advised: the equals and hashCode methods are no longer well defined on such a list. Some list implementations have restrictions on the elements that they may contain. For example, some implementations prohibit null elements, and some have restrictions on the types of their elements. Attempting to add an ineligible element throws an unchecked exception, typically NullPointerException or ClassCastException. Attempting to query the presence of an ineligible element may throw an exception, or it may simply return false; some implementations will exhibit the former behavior and some will exhibit the latter. More generally, attempting an operation on an ineligible element whose completion would not result in the insertion of an ineligible element into the list may throw an exception or it may succeed, at the option of the implementation. Such exceptions are marked as "optional" in the specification for this interface. This interface is a member of the Java Collections Framework.Since:1.2See Also:Collection, Set, ArrayList, LinkedList, Vector, Arrays.asList(Object[]), Collections.nCopies(int, Object), Collections.EMPTY_LIST, AbstractList, AbstractSequentialListMethod SummaryAll Methods Instance Methods Abstract Methods Default Methods Modifier and TypeMethod and Descriptionbooleanadd(E e)Appends the specified element to the end of this list (optional operation).voidadd(int index, E element)Inserts the specified element at the specified position in this list (optional operation).booleanaddAll(Collection

This table lists the sequence operations sorted in ascending priority. In thetable, s and t are sequences of the same type, n, i, j and k areintegers and x is an arbitrary object that meets any type and valuerestrictions imposed by s.


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Sequences of the same type also support comparisons. In particular, tuplesand lists are compared lexicographically by comparing corresponding elements.This means that to compare equal, every element must compare equal and thetwo sequences must be of the same type and have the same length. (For fulldetails see Comparisons in the language reference.)

What has happened is that [[]] is a one-element list containing an emptylist, so all three elements of [[]] * 3 are references to this single emptylist. Modifying any of the elements of lists modifies this single list.You can create a list of different lists this way:

key specifies a function of one argument that is used to extract acomparison key from each list element (for example, key=str.lower).The key corresponding to each item in the list is calculated once andthen used for the entire sorting process. The default value of Nonemeans that list items are sorted directly without calculating a separatekey value.

This method modifies the sequence in place for economy of space whensorting a large sequence. To remind users that it operates by sideeffect, it does not return the sorted sequence (use sorted() toexplicitly request a new sorted list instance).

CPython implementation detail: While a list is being sorted, the effect of attempting to mutate, or eveninspect, the list is undefined. The C implementation of Python makes thelist appear empty for the duration, and raises ValueError if it candetect that the list has been mutated during a sort.

The advantage of the range type over a regular list ortuple is that a range object will always take the same(small) amount of memory, no matter the size of the range it represents (as itonly stores the start, stop and step values, calculating individualitems and subranges as needed).

Return a list of the words in the string, using sep as the delimiter string.If maxsplit is given, at most maxsplit splits are done, the rightmostones. If sep is not specified or None, any whitespace string is aseparator. Except for splitting from the right, rsplit() behaves likesplit() which is described in detail below.

Return a list of the words in the string, using sep as the delimiterstring. If maxsplit is given, at most maxsplit splits are done (thus,the list will have at most maxsplit+1 elements). If maxsplit is notspecified or -1, then there is no limit on the number of splits(all possible splits are made).

The representation of bytes objects uses the literal format (b'...')since it is often more useful than e.g. bytes([46, 46, 46]). You canalways convert a bytes object into a list of integers using list(b).

Since bytearray objects are sequences of integers (akin to a list), for abytearray object b, b[0] will be an integer, while b[0:1] will bea bytearray object of length 1. (This contrasts with text strings, whereboth indexing and slicing will produce a string of length 1)

The representation of bytearray objects uses the bytes literal format(bytearray(b'...')) since it is often more useful than e.g.bytearray([46, 46, 46]). You can always convert a bytearray object intoa list of integers using list(b).

Split the binary sequence into subsequences of the same type, using sepas the delimiter string. If maxsplit is given and non-negative, at mostmaxsplit splits are done (thus, the list will have at most maxsplit+1elements). If maxsplit is not specified or is -1, then there is nolimit on the number of splits (all possible splits are made).

Return a list of the lines in the binary sequence, breaking at ASCIIline boundaries. This method uses the universal newlines approachto splitting lines. Line breaks are not included in the resulting listunless keepends is given and true.

For non-contiguous arrays the result is equal to the flattened listrepresentation with all elements converted to bytes. tobytes()supports all format strings, including those that are not instruct module syntax.

A string containing the format (in struct module style) for eachelement in the view. A memoryview can be created from exporters witharbitrary format strings, but some methods (e.g. tolist()) arerestricted to native single element formats.

Keys and values are iterated over in insertion order.This allows the creation of (value, key) pairsusing zip(): pairs = zip(d.values(), d.keys()). Another way tocreate the same list is pairs = [(v, k) for (k, v) in d.items()].

If you access a method (a function defined in a class namespace) through aninstance, you get a special object: a bound method (also calledinstance method) object. When called, it will addthe self argumentto the argument list. Bound methods have two special read-only attributes:m.__self__ is the object on which the methodoperates, and m.__func__ isthe function implementing the method. Calling m(arg-1, arg-2, ..., arg-n)is completely equivalent to calling m.__func__(m.__self__, arg-1, arg-2, ...,arg-n).

As part of its enforcement efforts, OFAC publishes a list of individuals and companies owned or controlled by, or acting for or on behalf of, targeted countries. It also lists individuals, groups, and entities, such as terrorists and narcotics traffickers designated under programs that are not country-specific. Collectively, such individuals and companies are called "Specially Designated Nationals" or "SDNs." Their assets are blocked and U.S. persons are generally prohibited from dealing with them. View more information on Treasury's Sanctions Programs.

This document may only be used if the period of endorsement has not yet expired and the proposed employment does not conflict with any restrictions or limitations listed on Form I-94 or I-94A, Arrival-Departure Record. Note: Some individuals who present this List A document, such as certain nonimmigrant students and exchange visitors, must present additional documentation in order to prove their work authorization in the U.S.

The Spanish Constitution reserves certain rights in relation to the heritage to the central government. However, these are delegated to the competent agencies in the Autonomous Communities, in this case the Xunta de Galicia. For the Lugo walls the Xunta is in the position of both owner and competent agency. Under the Galician Heritage Law the Xunta is required to cooperate with the municipal authorities in ensuring the protection and conservation of listed monuments, and certain functions are delegated down to them. The Xunta operates through its General Directorate of Cultural Heritage (Direccin General de Patrimonio Cultural), based in Santiago de Compostela. 17dc91bb1f

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