Python learning-How to implement an iterative object (itearable) and an iterator (iterator)

About Object iterable and iterator objects that can be iterated iterator

An iterative object: An object that can act directly on a for loop is called an iterative object: Iterable. An iterative object contains an __iter__ method, or __getitem__ method, where the __iter__ method returns an iterator iterator.

　　　　　　An iterative object is a collection of data types, such as List,tuple, Dict, Set,str, and another type of iterative object that is the generator generator.

Iterator object: An object that can be used as the next () function is an iterator object. An iterator object must implement the __next__ method.

For loop, if the loop is an iterative object iterable, it calls the Iterable __iter__ method, returns an iterator, and then calls his next method until a Stopiteration exception is encountered to jump out of the loop.

If the loop is an iterator object, call the next method directly, knowing that a stopiteration exception has been encountered to jump out of the loop.

Sir, as an iterator object, it is regenerated into an iterative object.

From collections Import iterator,iterable
class Aiterator (Iterator):
def __init__ (self, S, e):
self.current = s
self.end = e
# def __iter__ (self):
# return self
def __next__ (self):
if self.current < self.end:
Self.index = self.current
self.current + = 1
return Self.index
Else:
Raise Stopiteration
class Aiterable:
def __init__ (self,s,e):
Self.s=s
self.e=e
def __iter__ (self):
return Aiterator (SELF.S,SELF.E)

it = aiterator (1,10)
iteable=aiterable (2,5)
For i in it:
print (i)

Python learning-How to implement an iterative object (itearable) and an iterator (iterator)