iterable customers

To implement a class that can be used with a foreach loop, you must implement Iterable, which overrides a Iterator method, which returns a iteratorThe code is as follows:public class Itertest implements IterableStores the contents of the array private object[] Obj=new object[1];//record the number of elements added to the private int size;Records the current element's subscript private int current=0;//add element public void Add (String str) {Determ

This function functions as a function ,iterable Each item of the object as a parameter, and then calculates the output iteration sub - iterator. If function object functions can enter multiple parameters, then it can be followed by multiple objects that can be iterated. When multiple iterations of an object, the shortest object is judged by the result of the run. Example:#map () x = Range (Ten) print (list (map (hex, x)) Print (list (map (lambda y:y

This function is implemented to sort the iterable of an iterative object . The optional parameter key is a function of the comparison key;Reverse is a Boolean value that indicates whether to reverse-arrange the items in the object. Example:#sorted () print (sorted ([5, 2, 3, 1, 4])) print (sorted ({1: ' D ', 2: ' B ', 3: ' B ', 4: ' E ', 5: ' A '}, reverse = True)) print (sorted ("This was a test string from Andrew". Split (), Key=str.lower)) Student_

This function returns a frozen collection. The so-called freeze is that this collection can no longer add or remove elements from any collection. So the difference between set and set is that set is the element that can be added or deleted, and frozenset not. The main function of Frozenset is fast, which is realized by using hash algorithm. The parameter iterable is an object that represents an iteration, such as a list, a dictionary, a tuple, and

Returns trueif all elements of an object that can iterate are true if there is one element, otherwise Falseis returned. Or the iterator object is empty and also returns False. This function is mainly used to determine whether the list, tuple, dictionary and other objects have elements of True, increase the speed of computation, the equivalent code is as follows:def any (iterable):For element in iterable:If element:Return TrueReturn FalseExample:#any

There is a iterator () method in the list, set, queue, which is defined in the collection interface before JDK5 appears, and the list, set, and queue are inherited from Collecition. So they all have the iterator () method. The iterator () method returns the action object for the Java.util.Iterator interface, which includes all the objects that the collection collects, and you can use iterator Hasnext () to see if there is a next object, if any, You can use next () to get the next object. After

iterator it is. It only needs to obtain this iterator interface, which is the power of object-oriented. All collection classes implement the collection interface, while collection inherits the iterable interface. /** * Implementing this interface allows an object to be the target of * the "foreach" statement. * * @param In a specific implementation class (such as arraylist), an itr internal class is maintained internally, which inherits the iterat

The ES6 Standard introduces new iterable types, Array Map and all of Set them belong to iterable types. a collection of 1.for of loops with a iterable type can be traversed by a new for ... of loop. var a = [' A ', ' B ', ' C '];A.name = ' Hello ';for (var x of a) {alert (x); ' A ', ' B ', ' C '} for ... of for ... in What is the difference between loops and loop

Http://stackoverflow.com/questions/6863182/what-is-the-difference-between-iterator-and-iterable-and-how-to-use-themIterator is an interface, which have implementation for iterate over elements. Iterable is an interface which provides Iterator.An implementation of being one Iterable that provides an of Iterator itself: Public Interface

This function is used to traverse all elements from an iterative object iterable , and evaluates to True When each element is run as a parameter to a function object. element is preserved, while the element that is False is skipped, which is the goal of filtering unwanted elements. The parameter iterable is an iterative object, such as a list, dictionary, string, or function object with an iterator. Para

(Reproduced: http://blog.csdn.net/passionkk/article/details/49929887)In Python list,truple,str,dict these can be iterated, but they are not iterators. Why?Because there is a big difference compared to iterators, list/truple/map/dict the size of the data is deterministic, that is to say how many things are known. But the iterator is not, the iterator does not know how many times to execute, so it can be understood to not know how many elements, each call to next (), will go down a step, is inert.

Package Java.lang;Import Java.util.Iterator;Public interface Iterable Iterator}Iterable is located in the Java.lang package, which holds a iterator referencePackage java.util;Public interface Iterator Boolean hasnext (); E next (); void Remove ();}Iterator is also an interface that contains three methods, Hasnext, Next, remove Public Interface extends iterableJava.util.Collection inherits from J

Python error TypeError: 'nonetype 'object is not iterable solution, typeerroriterable Python error TypeError: 'nonetype 'object is not iterable Solution TypeError: 'nonetype 'object is not iterable. This error message generally occurs when None is assigned to multiple values. Def myprocess (): a = B if! = B: return True, value; flag, val = myprocess () In the

it is removed, then the cursor value must be reduced by one. In fact, the implementation of the iterator here is basically covered by abstractlist subclasses, such as Linkedlist,arraylist. The former does not support random access must not use the index value as the implementation of the acquisition element, otherwise the efficiency of the iterator is too low.Listiterator (extends IteratorIn addition to inheriting the Iterable interface, the list int

List (set (map (lambda tp_id:tp_id If not (' # ' in tp_id) and Len (Tp_id.strip (). replace (' \ n ', ')) > 0else None, open (' Tp_list.txt '). ReadLines ()). Sort ()))To practice the map, think of a loop as a line of code.There is a problem with the structure running program: TypeError: ' Nonetype ' object is not iterable.Find a half-day error (write a line of code at this time is really dead)Found to be the sort problem, the list's member method sort () Sorts a list (which changes the list) bu