python iter example

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

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 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 Objec

forIteminchnreadlines ():PrintItemCustom generator based on Seek and tell Nreadlinessecond, the iterator iteratorsAn iterator is just a container object that implements an iterator protocol. It has two basic methods:1) Next methodReturns the next element of the container2) __iter__ methodReturns the iterator itselfIterators can be created using the built-in ITER method, see example:>>> i =

end of a catch stopiteration exception2.iterITER is an iterator. Let's first cite an example:>>> alist=[1,2,3]>>> iter=iter (alist) >>> iter.__next__ () 1>>> Next (Iter) 2The above steps are:1) Create a list2) returns an iterator via the

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 iteratio

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

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 _ (

'] = 456Print(obj)= = "{' K1 ': 123, ' K2 ': 456}Python single-instance mode#Python Single-instance mode#1. Using the class method to implement#2. Using static fields to implementclassfoo:instance=Nonedef __init__(self,name): Self.name=name @classmethoddefget_instance (CLS):#CLS class name ifCls.instance:#If the static field instance is True returncls.instanceElse: obj= CLS ('Alex') Cls.in

python#coding =utf-8DefIter_test(): i = iter (' Happy ')#!!!try: while True: print i.next () except stopiteration: pass s = { Span class= "hljs-string" > ' one ': 1, ' ": 2, ' three ': 3} print s M = iter (s) #!!! try: while True: print m.next () #s [M.next ()] except Stopiteration: passif __name__ = = ' __main__ ': iter_test () Results:happy{‘thr

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

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)

#-*-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

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

can be queried either by the Get method or by key directly, but if the key does not exist, the error will be given, and get will give noneYou can add or change dict,dict (' key ') directly =valueYou can use the Pop method Dict.pop (Key[,default]) to delete the elements within the dict with the key value and return the value corresponding to the deleted key. If key does not exist and the default value is not set, the Keyerror exception is returnedYou can use the Clear Method Dict.clear () to emp

This function returns an iteration sub-object. When the second argument does not appear, the parameter object should be a container that supports iterative protocols , that is, there is a __iter__ () function defined, or a sequence access protocol, which defines The __getitem__ () function of the object, otherwise the TypeError exception is returned. When the second parameter Sentinel appears, the parameter object should be a callable object that defines the __next__ () function, which throws a

Python decorator use example and actual application example, python example Test 1 Deco is running, but myfunc is not running Copy codeThe Code is as follows:Def deco (func ):Print 'before func'Return func Def myfunc ():Print 'myfunc () called'Myfunc = deco (myfunc) Test 2

Details about the Python mail sending example and the python mail sending example Python needs two modules: smtplib and email. It is also because we can import these modules in our actual work that it makes processing tasks easier. Today, let's take a good look at sending em

Boost. python compilation and example, boost. python example Welcome to reprint, reprint please indicate the original address: http://blog.csdn.net/majianfei1023/article/details/46781581 Linux compiled boost link: http://blog.csdn.net/majianfei1023/article/details/46761029 Yesterday, we compiled and installed boost.