yield keyword

Iterator one, what is an iterator#迭代器即迭代的工具, what is iteration? #迭代是一个重复的过程, the iteration is repeated every time, and the result of each iteration is the initial value of the next iteration while True: #只是单纯地重复, and therefore not the iteration

List-GeneratedNow there's a need to look at the list [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] and ask you to add 1 to each value in the table, how do you do that? You might think of 2 waysTwo-Force Youth edition>>> a[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>>> b = []>>>

1. PrefaceUsually development often use JS asynchronous programming, because the front-end display page is based on the network set-top box (IPTV general performance is not very good, Ott better), the company mainly to take the way of asynchronous

-Generator When we call a normal Python function, we typically start with the first line of the function, ending with a return statement, an exception, or the end of the function (which can be considered an implicit return of none). Once

With list generation, we can create a list directly. However, with memory limitations, the list capacity is certainly limited. Also, creating a list of 1 million elements takes up a lot of storage space, and if we just need to access the first few

Original: https://www.ibm.com/developerworks/cn/opensource/os-cn-python-yield/index.htmlNovice Python developers often find a lot of Python functions used in the yield keyword, however, with the yield of the function execution process is not the

This article mainly introduces the use of Python yield, this article gives a number of examples to analyze the use of yield, the need for friends can refer to the Beginners Python developers often find many Python functions using the yield keyword,

As of today (2014.2), the latest stable version of PHP is PHP5.5, but almost half of the users are still using PHP5.2, which is not in the maintenance [note], and half the rest are using PHP5.3 [note].Because of PHP's "hundred Family" of the egg

Review the For loop in PythonIf you use an index to take a value, you can take the value anywhere, if you want to know where the value is.If we use a for loop to get the value, we take each value, do not need to care about the location of each value,

List-GeneratedTo generate [1x1, 2x2, 3x3, ..., 10x10]>>> [x * x for x in range (1, 11)]The For loop can also be followed by an if judgment>>> [x * x for x in range (1, one) if x% 2 = = 0][4, 16, 36, 64, 100] You can also use the two-layer loop to

1: What is an iteration in statement, the program automatically invokes the iterator object of the object being processed, and then uses its next__ () method until a Stopiteration exception is detected.>>> L = [n/A]>>> [x**2 for x in L][1, 4, 9]>>>

the big version of PHP is divided into three main branches: PHP4/PHP5/PHP6Among them, PHP4 because too old, the poor support of OO has been basically eliminated, please disregard PHP4.PHP6 because there is no application on the production line, but

IteratorsIndex: 1 = [+]For loop: For I in L:IPrint (dir ([])) tells the list all the methodsAs long as the data type that can be used for loop must have the __iter__ methodPrint ([].__iter__ ())A list that executes the return value after __iter__ ()

1. Can iterate:When we printPrint (dir ([up])) can be seen in the results that appear with' __iter__ ', this method, #次协议叫做可迭代协议A function that contains the ' __iter__ ' method is an iterative functionstrings, lists, tuples, dictionaries, and

Functions are the first class of objects: they can be used as data to pass1. Can be referenced2. Can be used as a function parameter3. Can return a value as a function4. Elements that can be used as container typesSmall example:deffunc1

The enumerate () function is used to combine a data object that can be traversed (such as a list, tuple, or string) into an index sequence, while listing data and data subscripts, typically used in a for loop.Cases1LST = ["a","b","C"]2 forI,

Tag: POS executes class return generator BSP result next bodyGenerator: With the yield keyword inside the function, the result of this function is the generator.The generator is essentially an iterator.return with, yield1,return can only return once

#Generator and co-process#A generator is a special iterator that also generates a sequence of values;#How do I define a generator? #method One: Use the yield keyword in the function; classCount_down (n): whileN>0:yieldN N-=1#Create a Builder

List derivation and builder expressionsWhen we create a list, we create an object that we can iterate over:>>> squares=[n*n for N in range (3)]>>> for I in Squares:print i014This creates a list of operations that are common, called list inference.

List derivation and generator expression When we create a list, we create an object that can be iterated: Copy Code code as follows: >>> squares=[n*n for N in range (3)] >>> for i in Squares: Print I 0 1 4 This is