iterable crunchbase

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

Statinfo = Os.stat (onefilepath) if Allfiles.has_key (statinfo.st_size): OneKey = allfiles[statinfo.st_size]is changed to Statinfo = Os.stat (onefilepath) if Allfiles.has_key (statinfo.st_size): OneKey = allfiles[statinfo.st_size] Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. Python TypeError: ' Builtin_function_or_method ' object is not

>>> A = [1,2,3,4,5,6]>>> for item in a: ... A.remove (item) ... >>> a[2, 4, 6]Does it feel strange to see the code above? Intuitively, we just want to remove each element of queue a sequentially, in turn, and why the final result is [2,4,6]? If you have enough wit, you should guess what the reason is. For each for loop, the current time a. After the Remove (item) execution is complete, a is relatively shortened, and the element following the item complements the previously deleted positi

package generic;import java.util.ArrayList;import java.util.Arrays;import java.util.Collection;import java.util.Iterator;public class ReversibleArrayList Anonymous internal class, iterable

This function creates a new dictionary from an object that can be iterated. For example, a tuple consisting of a list, or a Dictionary object.Example:#dict () #以键对方式构造字典d1 = dict (one = 1, one = 2, a = 3) print (D1) #以映射函数方式来构造字典d2 = Dict ([' One ', ' one ', ' B ', ' Three '], [1, 2, 3]) Print (d2) #可迭代对象方式来构造字典d3 = Dict ([' One ', 1), (' One ', 2), (' Three ', 3)]) print (d3) D4 = Dict (d3) print (D4)The output results are as follows:{' A ': 3, ' one ': 2, ' One ': 1}{' One ': 2, ' one ': 1, '

Respect original blogger, original link: 9953225ResolutionGenerally, the function returns a value of None and is assigned to multiple variables.Example look at the following:C=0def test (): if c = = 1: a = b = 1 return A, BA, B = Test ()When you call with a, B = Test (), you get an error: TypeError: ' Nonetype ' object is not iterableIn a Python judgment statement, when the IF condition is not satisfied and there is no else, it returns none, even if no return will default to Non

This function creates a new dictionary from an object that can be iterated. For example, a tuple consists of a list, or a Dictionary object.Examples:#dict () #以键对方式构造字典d1 = dict (one = 1, one = 2, a = 3) print (D1) #以映射函数方式来构造字典d2 = Dict ([' One ', ' one ', ' B ', ' Three '], [1, 2, 3]) Print (d2) #可迭代对象方式来构造字典d3 = Dict ([' One ', 1), (' One ', 2), (' Three ', 3)]) print (d3) D4 = Dict (d3) print (D4)The output results are as follows:{' A ': 3, ' one ': 2, ' One ': 1}{' One ': 2, ' one ': 1, ' T

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

it easier to extract what you want. Other solutions read HTML, you can define content as a function of an HTML hierarchy in which data is tagged. One such solution is Nokogiri, which supports parsing HTML and XML documents using the Ruby language. Other open source crawlers include pjscrape for JavaScript and beautiful Soup for Python. Pjscrape implements a command-line tool to crawl fully rendered pages, including JavaScript content. The beautiful Soup is fully integrated into the Python 2 and

the same result as the following generator code fragment: >>> def f (iterables): For x in iterables: For y in x: yield y >>> test = f (' ABCDEF ') >>> test.next () ' A ' >>> from itertools import chain >>> test = chain.from_ Iterable (' ABCDEF ') >>> test.next () ' A ' Combinations (iterable, R): Creates an iterator that returns all the

: print elABCDEF Chain. from_iterable (iterables ): An alternative chain constructor where iterables is an iteration variable that generates an iteration sequence. the result of this operation is the same as that generated by the following generator code snippet: >>> def f(iterables): for x in iterables: for y in x: yield y>>> test = f('ABCDEF')>>> test.next()'A'>>> from itertools import chain>>> test = chain.from_iterable('ABCDEF')>>> test.next()'A' Combinations (

Address: http://docs.python.org/library/functions.html Translation: Python provides many built-in functions. The following table lists and describes the functions in alphabetical order.ABS (X) Returns the absolute value of a number. The parameter can be a common integer, a long integer, or a floating point number. If the parameter is a plural value, its value is returned. For example, if a = x + yi, ABS (A) = SQRT (x ^ 2 + y ^ 2 ).All (iterable) Retu

the RDD is aggregated into a single collection, and an iterator that returns the collection of elements of the key in the two Rdd (K, (Iterable[V], Iterable[w])) . Where key and Value,value are tuples of two data sets of the same key under two Rdd.The generous box represents the Rdd, and the small box inside the generous frame represents the partition in the RDD. Merge the data in RDD1 (u1,1), (u1,2), and