python - Does range() really create lists? -

Both of my professors claim that category creates a list of values.

"Note: The Range function returns only a list of numbers from y to 1. For example, the category (5, 10) gives the list [5, 6, 7, 8] , 9].

I believe this is wrong because:

  type (category (5, 10))  range  is to run those channels again, to which I believe Is that labeling  category  a suo Is wrong in the form of chips.   
 
 
 In Python 2.x, returns a list, but Python 3.x gives an irreversible sequence, type.  
  Python 2.x:   
 >> gt; & gt; & gt; ; Type (category (10)) type 'list'> gt; & gt; & gt; type (format (10)) type 'xrange' & gt;    Python 3.x:   
  & gt; & gt; type (category (10)) & lt; class 'category' & gt;   
 In Python 2.x, if you want to get an iterative object in Python 3.x, you can use the function, which gives an indefinite sequence.  
   more  category  in Python 2.x  
 
  xrange ()  Over  range ()  is minimized (since when  xrange ()  creates values ​​even when asked for them) when using a very large range Memory-hungry machines or when elements of all borders are not used (such as when the loop is usually ended with a break).   
  Note:   
 
 In addition, using the integer created by  range ()  The only clear way of  is to run it again,   
 No. Since  category  objects are unchangeable scenes in Python 3, they also support indexing. Quote from  category  function documentation,  
 
 to implement all normal sequence operations except code generation and repetition  
 ...  
 Range objects implement ABC, and provide features such as containment tests,  element index lookup , slicing and support for negative indices. For example,   / P> 
  & gt; & Gt; & Gt; Category (10, 20) [5] 15> gt; & Gt; Category (10, 20) [2: 5] Category (12, 15) & gt; & Gt; & Gt; List (Category (10, 20) [2: 5]) [12, 13, 14]> gt; & Gt; & Gt; List (Category (10, 20, 2)) [10, 12, 14, 16, 18]> gt; & Gt; & Gt; 18 (10, 20) true in the range & gt; & Gt; & Gt; 100 Range (10, 20) False   
 It is possible with the invertible  category  sequence.  
 
 Recently, I faced a problem and I think it should be appropriate to be involved in it. Import itertools from Python 3.x code  
  islice number = category (100) items = list (islice (number, 10)) items: items = list (islice (number, 10) ) Print (item)   
 This code expects to print every 10 numbers as a list to 99. But, it will run infinitely, can you tell the reason?  
  Solution   
 
 Because  category  returns an unchanging  sequence , Is not an iterator object, whenever it is done on  islice  a  category  object, it always starts from the beginning, it is a drop-in replacement for an unchanging list Think of it as a question now, how will you fix it? Its simple, you have to get an iterator out of it. Just make changes 
 
  numbers = range (100)  
 
 
 
  numbers = IARs (limit (100))  
 
 Now,  numbers  is an object object and it remembers how long it lasted. Therefore, when  islisa  it repeats, it just starts from the place where it had already ended.