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Watching the sun fall into the West Lake in the wine room 　　 Some people say that drinking red wine breeds an attractive luster like Amber in the heart. In the joy of wine tasting, life becomes bright and mellow. Sunny afternoon, about three or two friends, open a bottle of red wine, sit in a place where the light can

Python iter () function usage Example Analysis, pythoniter This example describes the usage of the Python iter () function. We will share this with you for your reference. The details are as follows: The iterator in python is very clever to use. It can not only iterate sequences, but also iterate objects that exhibit sequential behavior, such as Dictionary keys, row of a file, and so on. The iterator hasnex

Watch the sun fall into the West Lake in the wine room 　　 Some people say that drinking red wine, the heart can breed like amber as tempting luster, in the joy of wine tasting, life becomes bright and mellow. In the sunny afternoon, about 32 friends, open a bottle of wine, sitting in a place where you can feel the li

A brief introduction to ITER function usageThere are two parameters for the ITER (object[, Sentinel) method in Python 3.This form of use of ITER (object) is more common.Iter (object, Sentinel) is generally less used in this form1,iter (object)The official Python documentation is easy to understand for this form of inte

This article mainly introduces the python iterator and iter () function details and related information about the instance. For more information, see the next article. it mainly introduces the python iterator and iter () for more information about functions and instances, see Iterator and iter () functions in python The iterator provides an interface for clas

Python standard library: built-in functions iter (object [, sentinel]), itersentinel This function returns an iteration sub-object. When the second parameter does not exist, the parameter object should be a container that supports the iteration protocol, that is, the _ iter _ () function is defined or the sequence access protocol is supported, that is, the Object Defining the _ getitem _ () function. Other

First, Generator (ITER)From Python2.2 onwards, the generator provides a concise way to help return the function of a list element to complete simple and efficient code.It is based on the yield instruction, allowing the STOP function and returning the result immediately.This function saves its execution context and, if necessary, resumes execution immediately.1, compare range and xrange difference>>> print Range [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]>>> print

1, first to an example, there is a preliminary impression:myTuple=(123,‘xyz‘,45.67)i=iter(myTuple)i.next()123i.next()‘xyz‘i.next()45.67i.nextcall""1in?StopIterationThe above code explicitly uses the iterator through the ITER () function, and the iterator is a class containing the next function, andUsually we are using such as:forin seq: do_something_to(i)Also used in the iterator, the actual working code

ITER () functionUsed to build iteratorsGrammarITER (object[, Sentinel])ParametersObject--->> collection object that supports iterationsSentinel--->> if the second argument is passed, the parameter object must be a callable object (such as a function), at which time ITER creates an iterator object, each time the __next__ () method of the Iterator object is called, Will Call objectreturn valueIterator ObjectI

Let's talk about this chapter. Manual iterations: ITER and Next1.nextWe've already mentioned this next in the last section, and we're going to expand it here, outside of the __next__ () method, we can also use the built-in function next (file) to implementHere are the two sets of code listings with the same functionality:>>> handler=open (' output_file.txt ') >>> next (handler) ' aaaaa\n ' >>> Next (handler) ' Bbbbb\ N ' >>> Next (handler) ' ccccc\n '

Link: "Meet a ITER, a taxi driver, must see": I'm not a communist in strict sense, but a staunch co-rich person must not be understood as an egalitarian person. It means that you drive a big run, I must at least be able to drive a run. This is my usual idea, not because others than I "strong", I am jealous, nor because I am weaker than others, I feel inferior. I keep a record of what's going on in my life, and it's just a record. Just feel life i

This article introduces the Python built-in iter function in detail: Iter (object [, sentinel]) Return an iterator object. the first argument is interpreted very differently depending on the presence of the second argument. without a second argument, object must be a collection object which supports the iteration protocol (the iter () method), or it must support

#-*-coding:utf-8-*-#python#Xiaodeng#Python's function usage iter ()#iter ()#Description: Call ITER () on an object to get its iterator" "iter (...) ITER (collection), iterator collection: Container iterator: Iterative object iter

Python built-in functions iter English document: Iter (object [, sentinel]) Return an iterator object. the first argument is interpreted very differently depending on the presence of the second argument. without a second argument, object must be a collection object which supports the iteration protocol (the _ iter _ () method ), or it must support the sequence p

1, Description: __getitem__\setitem can iterate, it has not been recommended; __iter__\next is recommended.2, Python will first check __iter__\next and then go to check __getitem__\__setitem__, that is __iter__ priority.Example:#!coding:utf-8#!python version 2.7classmysqence (object):def __init__(self,start,stop): Self.start=Start Self.stop=Stop Self.current=Startdef __iter__(self):return SelfdefNext (self):" "if it's a python3.0 environment, it's not using next anymore, it's changing the name t

English documents: ITER (object[, Sentinel]) Return an Iterator object. The first argument is interpreted very differently depending on the presence of the second argument. Without a second argument, object must be a collection object which supports the iteration protocol (the ITER () method), O R it must support the sequence protocol (the GetItem () method with an integer arguments starting at 0). If it d

English documents: ITER (object[, Sentinel]) Return an Iterator object. The first argument is interpreted very differently depending on the presence of the second argument. Without a second argument, object must be a collection object which supports the iteration protocol (the __ITER__ () method ), or it must support the sequence protocol (the __getitem__ () method with an integer arguments starting at 0). If it does not support either of those proto

This article mainly introduces the Python iterator and the ITER () function in detail and examples of relevant information, the need for friends can refer to the following Python in Iterators and ITER () functions Iterators provide an interface for class sequence objects with a sequence of classes. Python's iterations seamlessly support sequence objects, and it also allows programmers to iterate over non

OverviewThe greater credit for iterators is the interface that provides a unified access to the collection. Iterators provide an interface for class sequence objects with a sequence of classes . The iterator object is accessed from the first element of the collection until all of the elements have been accessed and finished. Iterators can only move forward without backing back . Python's iterations seamlessly support sequence objects, and it also allows programmers to iterate over non-sequential

Func (this *mongodb) storerecords (dbname, collection, Storedbname, tmpcollection string, QueryMap, Selecter Bson. M) (Err Error) {session: = this. GetSession () Defer session. Close () ITER: = Session. DB (dbname). C (collection). Find (QueryMap). Select (Selecter). Iter () Onemap: = Make (Bson. M) Historymapslice: = Make ([]interface{}, 0, Max_bulk_write_file_len) flag: = False for