Hi,
I'm an absolute beginner in Python (and in English too ;-)
Running this code:
--------------
# Python 3.9.0
a = [[1, 2, 0, 3, 0],
[0, 4, 5, 0, 6],
[7, 0, 8, 0, 9],
[2, 3, 0, 0, 1],
[0, 0, 1, 8, 0]]
b = ((x[0] for x in a))
print(list(b))
print(list(b))
---------------
I get this output:
[1, 0, 7, 2, 0]
[]
I don't know why the second print() output shows an empty list.
Is it possible that the first print() call might have changed the value
of "b"?
Thank you in advance.
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