Printing unpacked list

Asked Jun 10 '18 at 20:35

Active Jan 07 '23 at 07:53

Viewed 32 times

I can't understand why the second time the t_matix is looped over, nothing is printed.

In Python 2.x the second print is done correctly.
In Python 3.x (at least 3.6.3) that second print is not done.

What is happening with that t_matrix variable between the 2 loops?

matrix=[(1,2,3),(4,5,6),(7,8,9),(10,11,12)]
for row in matrix:
    print(row)
print("\n")
t_matrix = zip(*matrix)
for row in t_matrix:        # first print, printed ok
    print(row)
print('-' * 80)
for row in t_matrix:        # Second print, nothing shown
    print(row)

asked Jun 10 '18 at 20:35

Yves TF

`zip` returns a list in python 2, and an iterator in python 3. – Aran-Fey Jun 10 '18 at 20:38
Ok... But in Python 3 the first one printed and not the second one. The syntax is the same, so what happened with the t_matix variable? – Yves TF Jun 11 '18 at 07:25
It's all explained in the questions I linked. – Aran-Fey Jun 11 '18 at 07:53
Thanks! Didn't see the links the first time... – Yves TF Jun 11 '18 at 08:43

Printing unpacked list

0 Answers0