Why That Code Returns 'None' (Tuples in List)

posts = []
rows = [('02.02', 'title2', 'text2', 15, 1), ('01.02', 'title', 'text', 16, 1)]
rows = rows.sort(key=lambda x:x[3])
for i in range(2):
     posts.append(rows[i])
print(posts)

Why that code returns None and how can I fix it?

>Solution :

Instead of

rows = rows.sort(key=lambda x:x[3])

You want:

rows.sort(key=lambda x:x[3])

Because the .sort() will automatically update rows without the need to reassign like so:

posts = []
rows = [('02.02', 'title2', 'text2', 15, 1), ('01.02', 'title', 'text', 16, 1)]
rows.sort(key=lambda x:x[3]) #notice the change here
for i in range(2):
     posts.append(rows[i])
print(posts)

Output:

[('02.02', 'title2', 'text2', 15, 1), ('01.02', 'title', 'text', 16, 1)]

The .sort() function updates rows, but returns None.