Re-using zip iterator in python 3 [duplicate]

Question

I have the zip object:

L_RANGES = zip(range(10, 20), range(11, 21))

First call of L_RANGES is ok:

print(type(L_RANGES))
for a, b in L_RANGES:
  print(a, b)

Output:

<class 'zip'>
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20

Bu the next calls do not display anything. Is there any way to maintain or reset that. So far I can just convert it to the list:

L_RANGES = list(zip(range(10, 20), range(11, 21)))

Answer 1

If you were to create a generator each time you loop, that would solve everything, because you could reuse that multiple times. For that, convert L_RANGES from a simple generator to a lambda creating generators, but don't forget to "call" it each time with ():

L_RANGES = lambda: zip(range(10, 20), range(11, 21))

for a, b in L_RANGES():
  print(a, b)

for a, b in L_RANGES():
  print(a, b)

#works as many times as you want

Compared to the other answers this doesn't take up memory (which is the downside of converting to a list) and doesn't require multiple variables for each time you want to loop (by using tee) which makes this way more flexible (you can iterate 1000 times if necessary, without creating L_RANGES_1...L_RANGES_999) for example:

for i in range(1000):
    for a, b in L_RANGES():
        print(a, b)