Phaml Phaml - 1 month ago 7
Python Question

please delete my post thank you

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unable to delete and the moderator refused to delete it

Answer

If you think about it, you are looping over the list and each iteration, x is holding the sub list. You then are getting index 1 of each sub list, which gives you the 2nd column.

Picture it this way:

1, 2, 3

4, 5, 6

7, 8, 9

The bolded items are the items that are accessed in each iteration, and put into a new list, giving you [2, 5, 8]

The expanded list comprehension equivalent is:

col2 = []
for x in m:
    col2.append(x[1])