[Python] A rough understanding of iterators, iterators, and generators

I want to master Iterable, Iterator, and Generator, but honestly I can only understand it somehow, so I summarized it briefly so that it is easy to imagine.

Iterable

An object that can be used repeatedly. Objects of the list, dict, set and str classes are iterable. Simply put, what you can use with *** for syntax ***

Iterator

Iterators are a type of iterator (iterators are not necessarily iterators) Simply put, it's like a *** list *** returns the current element with next () and advances to the next element Simply put *** Take out something like a list until it's empty ***

Generator

If there is a [yield return value] in the function, that function is called a generator function. Also, the list comprehension that is changed from square brackets to parentheses is called a generator expression. Example *** (i for i in range (N)) *** The return value of that function or expression is called a generator iterator. Simply put, it is *** that returns an iterator ***.

Image diagram

Generator features

def sample():
    cumsum = 0
    for i in range(1, 5):
        cumsum += i
        print(f'First here →{cumsum}')
        yield cumsum

for cumsum in generator_sample2(): #point
    print(f'Yield minutes →{cumsum}')

***

*** First here → 1 Yield minutes → 1 First here → 3 Yield minutes → 3 First here → 6 Yield minutes → 6 First here → 10 Yield minutes → 10

Iterator features 1

sample_list = [i for i in range(1, 6)]
print(f'The contents of the list{sample_list}')

sample_iter = iter(sample_list) #iter()Make it an iterator

for i in sample_iter:
    print(i)
    
print(f'The contents of the list do not change{sample_list}')
print(f'Iterator becomes empty when used{list(sample_iter)}')

***

*** Contents of the list [1, 2, 3, 4, 5] 1 2 3 4 5 The contents of the list do not change [1, 2, 3, 4, 5] Iterators are empty when used []

Iterator feature 2

sample_list = [i for i in range(1, 6)]
print(f'The contents of the list{sample_list}')

sample_iter = iter(sample_list) #iter()Make it an iterator
print(f'Something like a list{sample_iter}') #I'm using it here
print(f'Can be seen as a list{list(sample_iter)}')

print(f'Iterator becomes empty when used{list(sample_iter)}')

***

*** Contents of the list [1, 2, 3, 4, 5] Something like a list <list_iterator object at 0x7fbf11e34b80> Seen as a list [1, 2, 3, 4, 5] Iterators are empty when used []

*** *** [About Iterable](https://python.ms/iterable/#_1-%E5%85%B7%E4%BD%93%E7%9A%84%E3%81%AB%E8%A8%80%E3 % 81% 88% E3% 81% B0) [About Iterator](https://python.ms/iterator/#_1-%E3%82%A4%E3%83%86%E3%83%AC%E3%83%BC%E3%82%BF%E3 % 82% 92% E8% A7% A6% E3% 81% A3% E3% 81% A6% E3% 81% BF% E3% 82% 8B% E3% 80% 82) About generators

• Somehow I understood while summarizing It's still a rough sketch, so I'll summarize it if I can understand it a little more *

** Addition **

@shiracamus Thank you for pointing out.