How to print each layer of this list?

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ls=[1,2,3,5,6,['1stlayer',1,2,3,4,5,['2ndlayer',1,2,3,4,5,['3rdlayer',1,2,3,4,5,['4thlayer',1,2,3,4,5,['5thlayer',1,2,3,4,5,['6thlayer',1,2,3,4,5,['7thlayer',1,2,3,4,5]]]]]]]]


print second layer

What I have tried:

i've tried doing the indexing like

print(ls[2][0])

but it gives me an error stating

'int' object is not subscriptable

Posted 23-Feb-22 2:00am

Member 15356357

Updated 23-Feb-22 2:48am

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OriginalGriff · Answer 1 · 2022-02-23T02:22:00

Solution 1

Look at your data (and it's kinda odd).
What is element 2 of ls?
Answer:

Python

ls[0] is 1,
ls[1] is 2,
ls[2] is 3,
...

And ls[5] is:

['1stlayer',1,2,3,4,5,['2ndlayer',1,2,3,4,5,['3rdlayer',1,2,3,4,5,['4thlayer',1,2,3,4,5,['5thlayer',1,2,3,4,5,['6thlayer',1,2,3,4,5,['7thlayer',1,2,3,4,5]]]]]]]

I suspect that you need to rethink exactly what your data should look like; I have no idea what you are trying to do, but that all looks very, very wrong!

Posted 23-Feb-22 2:22am

OriginalGriff

Updated 23-Feb-22 2:23am

v2

Comments

Member 15356357 23-Feb-22 8:32am

actually my teacher gives us in that way and we cant change the format or anything but we are only allowed to print the specific block from that list.. now idk how to print the specific block without printing the rest of the list. as ive said there i tried using indexing and it only gives me an error. i would really appreciate it if you could teach me.

Member 15356357 23-Feb-22 8:33am

the specific block i mean is like this ['1stlayer',1,2,3,4,5,

OriginalGriff 23-Feb-22 9:07am

You have to range it:

print(ls[5][0:6])

Richard MacCutchan 23-Feb-22 8:49am

It's valid Python, even if it does make your eyes go weird.

OriginalGriff 23-Feb-22 9:04am

Oh, I know - I ran it through a online Python interpreter to check what I was saying.

But it's very poor data design! :laugh:

Richard MacCutchan 23-Feb-22 9:07am

But that's the beauty of Python, crap design is not an issue. BTW to print the last item it is:

print(ls[5][6][6][6][6][6][6][:6])

OriginalGriff 23-Feb-22 9:28am

:laugh:
As you say, not an issue at all!

Member 15356357 23-Feb-22 9:10am

Thank you

OriginalGriff 23-Feb-22 9:28am

You're welcome!

Richard MacCutchan · Answer 2 · 2022-02-23T02:48:00

You need to get used to understanding the relative positions of each item in the list(s). The item you are interested in starts at position 5 of ls. And that item contains 6 elements. So the print statement you need is:

Python

print(ls[5][:6])

That is to say, print the first 6 elements of the element at offset 5. Try a few other values for yourself.

[edit]
It occurred to me on re-reading this that the above statement might make more sense if re-written as:
Select the item at offset 5 of ls, and print its first 6 items.
[/edit]