iterable api

Off Topic:Recently, because the course needs to get into the Python language. Because Java, C + +, and other strongly typed static languages have been used all the time, it is now suddenly true that Python does feel a great difference.The intuitive feeling is that in Python you can always find something that makes the code smart, concise, efficient, and aesthetically pleasing, making the beginner's process of writing the code full of surprises, and gradually becoming fond of python. And the offi

Refer to official Documentation:1 Iterable is an object that can return its members . Includes sequence types (list,str,tuple) and not-sequence types (dict, file objects), objects and classed defined with an __iter__ ( ) method or a __getitem__ () methodWhen a Iterable object is passed into the ITER () method (also called the __iter__ () method), a iteratoris returned. This is the method of explicitly creat

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

Parent interface of Collection:iterable interfaceA class that implements the Iterable can is used with the new for-loop.The interface has only one Iterable method:Public interface IterableIt is possible to use your own collection type classes with the new For-loop. To does so, your class must implement the java.lang.Iterable interface. Here is a very basic example:public class MycollectionAnd here is the co

In Java, it's always confusing for an array to be able to use a foreach statement.For objects that can be traversed with a foreach statement, there are only two cases, one of which is that traversing an object must implement the Iterable interface and implement the Ierator () method, which is the premise of the object using the foreach statement. Another case is a special object array. So how do you understand how to use foreach for arrays?The first t

This function is used to calculate the iterable of an iterative object and then add the value of start with this result . The parameter start is used to specify the parameter to add, and if this value is not set, the default value is 0 . The sequence to be computed is generally a numeric type, and the start parameter is set to the number type. In other cases, it is better to use other calculations and methods, such as calculating the string and using

Max (Arg1, arg2, *args[, key])This function is to iterate over the object iterable to find out the maximum value to return. When the key parameter is not empty, it is judged by the function object of key. Example:#max () Array1 = Range (Ten) Array2 = Range (0, 3) print (' max (array1) = ', Max (array1)) print (' max (array2) = ', Max (array2)) Print (' Max (array1, ') = ', Max (array1, Key=lambda x:x > 3)) print (max (1, 2)) (max (' ah ', ' BF ', Key

Min (arg1, arg2, *args[, key])This function is the iteration object iterable to compare, find the minimum value to return. When the key parameter is not empty, it is judged by the function object of key. Example:#min () Array1 = Range (Ten) Array2 = Range (0, 3) print (' min (array1) = ', min (array1)) print (' min (array2) = ', min (array2)) Print (' min (array1,) = ', Min (array1, Key=lambda x:x The resulting output is as follows:Min (array1) = 0Mi

Returns Trueif all the elements of an object that can be iterated are all non-empty (or an empty iteration object). This function is mainly used to determine whether the list, tuples, dictionaries and other objects have empty elements, such as a list of 10000 elements, if you do not provide this function, you need to use a loop to implement, then the calculation will be slower. This function is equivalent to the function of the following code:def all (iterab