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Python---Iterator

# iterator fromcollectionsimportiterablefromcollectionsimportiterator# The data types that can directly act on for a loop have the following #1. Collection data types, such as list, tuple, dict, set, SRT, and #2.generator, including generators and yield generator function# these objects, which can be directly applied to a for loop, are called iterative objects:iterable# use Isinstance () to determine whether an object is a Iterable object print ( Isi

Getting started with Python: Generators & iterators

.__next_ _ () print (' Start ready to make buns! ') For I in range: time.sleep (1) print ("Made 2 buns!") C.send (i) c2.send (i) Producer ("Mike")  Three, iteratorsWe already know that for there are several types of data that can be directly acting on a loop:A class is a collection of data types:,,,, list tuple dict set str ;The class is: generator , including the generator and yield the generator function with the band.These objects, which can be directly appli

Python Basics-built-in functions (1)

Python provides a number of built-in functions.First, the numerical processing correlation function:1, take absolute value: ABS ()def # Real signature Unknown """ "" " passABS ()2. Turn binary: Bin ()def # "" " Return The binary representation of an integer. >>> bin (2796202) ' 0b1010101010101010101010 ' "" "3, turn octal: Oct ()def # "" " Return The octal representation of an integer. >>> Oct (342391) ' 0o1234567 ' "" "4, ext. 16: Hex

Yield of the Python generator

a List of 1000 elements, and the code:For I in Xrange (£): PassThe next value is returned in each iteration, and the memory footprint is small. Because Xrange does not return a List, it returns a generator, (List is an iterative object). An iterative object can return a iterator object by calling the Iter method, and then for loop access:class Iterable_: def __iter__ (self): return iter ([1, 2, 3]) = iter ((Iterable_ ())) it: Print "

Python function map

Map (function, iterable, ...)Apply function to every item of iterable and return a list of the results. If additional iterable arguments is passed, function must take that many arguments and is applied to the items from all I Terables in parallel. If one iterable is shorter than another it's assumed to be extended with

Python Basics-built-in functions-scopes-closures-recursive-python3

Built-in functions-scopes-closures-recursion1. Several built-in functions that may be usedView built-in functions: Print (DIR (__builtins__)) Common functions: Len for length min min Max maximum sorted sort, small to large reversed inverse sum summation conversion: The bin () conversion to the binary Oct () conversion to octal hex () to Hex ord () converts the character to the corresponding ASIIC code value CHR () converts the ASIIC code value to the corresponding character supplement: 1.enum Er

Python: iterators

In the process of using Python, it is easy to confuse the following concepts of correlation: Container (Container) An iterative object (iterable) Iterators (Iterator) Generator (Generator) Builder expression {list, set, dict} analytic type 1. Container (Container)A container is a data structure used to store elements, which supports the test of membership, where the container stores all the data in memory, and typical

The use of reduce built-in functions in Python guide _python

Official explanation: Apply function of two arguments cumulatively to the ' items of iterable, from left to right, so as to reduce the iterable to A single value. For example, reduce (lambda x, Y:x+y, [1, 2, 3, 4, 5]) calculates ((((1+2) +3) +4). The left argument, X, are the accumulated value and the right argument, y, are the update value from the iterable

A student achievement management system prepared by sinks

ah,09h lea dx,h9 int 21h mov ah,01h int 21h CMP al,36h JG kerror CMP al,30h JB kerror cmp al,31h JE N1 cmp al,32h JE N2 cmp al, 33h JE N3 cmp al,34h JE N4 cmp al,35h JE N5 cmp al,36h JE exit N1:huanhang call Input jmp N0 N2:huanhang mov ah,09h lea dx,h10 int 21h call NewFile jmp N0 Huanhan G N3:huanhang mov ah,09h lea dx,h11 int 21h call WriteFile Huanhang jmp N0 N4:hu Anhang mov ah,09h lea Dx,h12 int 21h call ReadFile huanhang jmp N0 N5:huanhang Call output jmp N0 kerror:call error1 exit

MD5 Delphi source code

// Tabs = 2// Configure //-----------------------------------------------------------------------------------------------//// MD5 message-digest for Delphi 4//// Delphi 4 unit implementing// RSA Data Security, Inc. MD5 message-Digest algorithm//// Implementation of Ronald L. Rivest's RFC 1321.//// Copyright? 1997-1999 medienagentur fichtner Meyer// Written by Matthias fichtner//// Configure //----------------------------------------------------------

[Reprint] MPEG-4 AVC/H.264 video codecs list (from doom9)

Now we prepare information for second H. 264 codecs comparison test, that will be compared with more advanced metrics. so we collect information about current available codecs and there stage. if you have any information about this codecs or another codecs please replay this message!List of MPEG-4 AVC/H.264 video codecs(Last updated 1 December 2005-62 items now !) ---------------------------------------------------------- Software codecs: --------------------- Ateme H.264/MP

Available MD5 algorithms for delphi xe

, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00,$00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00,$00, $00, $00, $00, $00, $00, $00, $00 ); Implementation Function F (x, y, z: DWORD): DWORD;BeginResult: = (x and y) or (not x) and z );End; Function G (x, y, z: DWORD): DWORD;BeginResult: = (x and z) or (y and (not z ));End; Function H (x, y, z: DWORD): DWORD;BeginResult: = x xor y xor z;End; Function I (x, y, z: DWORD): DWORD;BeginResult: = y xor (x or (not z )

Description of the ADODB class in PHP

driver of PostgreSQL, Informix, and Sybase is contributed by the development of the free software community ). One of the biggest advantages of using ADODB is that, regardless of the backend database, the methods for accessing the database are the same, so developers do not have, however, you must learn another set of different access methods, which greatly reduces the knowledge burden on developers. the previous knowledge can still be used in the future. when the database platform is transfer

Deep understanding of the volatile keyword

is invalid, and then threads 1 read, found that their cache row is invalid, It waits for the cache line corresponding to the main memory address to be updated, and then goes to the corresponding main memory to read the latest value. Then thread 1 reads the latest correct value. 2.volatile guaranteed atomicity. Knowing the volatile keyword above guarantees the visibility of the operation, but volatile guarantees that the operation of the variable is atomic. Let's look at an example: public

Java concurrent Programming: Volatile keyword detailed resolution _java

layer, is the CPU L1 or L2 cache of the corresponding cache line invalid); Third: Because the cached row of the cached variable stop in thread 1 's working memory is invalid, thread 1 reads the main memory again when the value of the variable stop is read. Then thread 2 modifies the stop value (there are 2 operations here, of course). Modifying the value in the thread 2 working memory and then writing the modified value to memory invalidates the cached row of the cached variable stop in the w

Explain the role of volatile keywords in Java threading programming _java

before writing the volatile variable).Thread A writes a volatile variable, and then thread B reads the volatile variable, which essentially is thread a sending a message to thread B through main memory. Does 5.volatile guarantee atomic sex? Knowing from above that the volatile keyword guarantees the visibility of the operation, but does volatile guarantee that the operation of the variable is atomic? Let's look at an example: public class Test {public volatile int

Python section Fourth

that can directly act on a for loop are called an iterative object: Iterable.You can use Isinstance () to determine whether an object is a Iterable object:xuliangwei:~ xuliangwei$ Python3>>>>>> from collections Import iterable>>> isinstance ([], iterable)True>>> isinstance ({}, iterable)True>>> isinstance (' abc ',

List of Python data types

I. Basic data typesInteger: intString: str (note: \ t equals a TAB key)Boolean value: BOOL  Listing: Listlist with []Ganso: TupleFor Ganso ()Dictionary: DictNote: All data types exist in the class column that you want to correspond to.Two. List all data types:Basic operation: Index Slice Additional Delete Length Slice Cycle Contains ListclassList (object):"""list (), New empty list List (iterable), new list in

Guide to Using reduce built-in functions in python, pythonreduce

Guide to Using reduce built-in functions in python, pythonreduce Official explanation: Apply function of two arguments cumulatively to the items of iterable, from left to right, so as to reduce the iterable to a single value. For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates ((((1+2)+3)+4)+5). The left argument, x, is the accumulated value and the right argument, y, is the update value from

Python built-in functions

Python built-in functions Dir (_ builtins __) 1. 'abs '. Obtain the absolute value of the input parameter. abs(x, /) Return the absolute value of the argument. 1 >>> abs(10)2 103 >>> abs(-10)4 10 2. 'all' is used to determine whether all elements in the given iterable parameter are not 0, '', False, or iterable empty. If yes, True is returned. Otherwise, False is returned. all(

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