Python builder, iterator, iterator object

Changing a list [] to () creates a generator: Generator,generator is the algorithm that is saved.

Data types that can be used for a For loop:
1. Collection type: List tuple dict set str
2, generator

An object that can directly act on a for loop is collectively known as: An Iterative object (iterable)

 from Import iterable Print (Isinstance ([],iterable)) Print (Isinstance ({},iterable)) Print  for  in range (iterable))print(isinstance (iterable))

Results:

Truetruetruefalse

An object that can be called by Next and continually returns the next value is called an iterator (Iterator)

 from Import Iterator Print (Isinstance ([],iterator)) Print (Isinstance ({},iterator)) Print  for  in range (Iterator))print(isinstance (Iterator))

Results:

 from Import Iterator Print (Isinstance ([],iterator)) Print (Isinstance ({},iterator)) Print  for  in range (Iterator))print(isinstance (Iterator))

turn list , dict and str wait for the Iterable Iterator function to be used iter() :

#!/usr/bin/env python#-*-coding:utf-8-*- fromCollectionsImportIteratorPrint(Isinstance (iter([]), Iterator))Print(Isinstance (ITER ({}), Iterator))Print(Isinstance (x forXinchRange (10)) , Iterator))Print(Isinstance (ITER ('ABC'), Iterator))

Show Results:

Truetruetruetrue

Python builder, iterator, iterator object