How can I print python generator object in reversed order?

Question

I have the following code:

def generatorFun(n):
    number = 0
    while number < n:
        yield number
        number += 1
myGenerator = generatorFun(10)
print(next(myGenerator))
print(next(myGenerator))
print(next(myGenerator))

How can I print the result in reversed order? 10 9 8 7 ....

Thanks in advance!

You should give this a look https://stackoverflow.com/questions/1561214/python-reverse-generator — WArnold, Aug 09 '21 at 18:15
You have to store all the values in a container, like a list, and then iterate over that in reverse — juanpa.arrivillaga, Aug 09 '21 at 18:17

score 2 · Answer 1 · answered Aug 09 '21 at 18:15

2

Not possible without storing the values in a list and reversing the list. Reversing a generator directly isn't possible because generators can be infinite:

def infinite():
    while True:
        yield 1

answered Aug 09 '21 at 18:15

ForceBru

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Isn't it possible with tuples, too? – Kelly Bundy Aug 09 '21 at 18:18
1

@KellyBundy, yeah, any storage will work: lists, tuples, dictionaries, `array.array`s, `collections.deque`s - anything that stores the values of the generator in memory – ForceBru Aug 09 '21 at 18:19

How can I print python generator object in reversed order?

1 Answers1