[Solved](Python)Is that a way to access an element in an array?

Question

array={[1,2],[3,4]}
Can i write a line to ask Python to print the element "2" directly?

Answer 1

Oh it looks like you have to define an array using [] instead of {}. Look at the following code

https://code.sololearn.com/c3hrKJ23XPw6/?ref=app

Answer 2

Ah… I got it! I did some test and it seems it works for () and [], but never {}. Thank you very much for helping me understand!

https://code.sololearn.com/cNr1Cdi8If1o/?ref=app

Answer 3

静文 毛 Sets are similar to lists or dictionaries.
They are created using curly braces, and are unordered, which means that they can't be indexed.

Due to the way they're stored, it's faster to check whether an item is part of a set using the in operator, rather than part of a list.

a = {1,2,3,4}
print(3 in a)

Answer 4

Lea a list makes it ordered because it can be indexed.
And indexing starts from Zero
Eg.
a = [1,2,3,4]
print(a[0]).
Whereas.
A set is unordered and can't be indexed.
The difference is you can access elements in a list by their index while an element in a set is accessed using the in keyword

Answer 5

MATOVU CALEB Ok, understand, thank you for helping me!

Answer 6

Let me put this for future help and to anyone who comes across this.
Use:
() for tuples
[] for lists
{} for sets and dictionaries

Whenever you want to index, make sure you build your arrays using lists. It helps a lot also whenever you want to change items in the list unlike tuples where you index but can't items in the tuple

With dictionaries, you will index the keys in order to get the values. For sets, it's more useful in mathematics. Basically Real Analysis.

In your case, a more elaborate answer would be,

Array = [[1,2], [1,3]] #N/B this is now a 2D array in the case of numpy

To print 2 directly. Note that the first element in the array is, [1,2] and the second element is [1,3]. Don't forget python is a zero indexing language. Thus,

array[0][1] prints 2 as the output.

[0] means the first item in the array list. And [1] means the second element in the first element of array list.

I hope this clarifies further and adds more on top of the variety of feedbacks you have gotten.

Answer 7

You mean, other than the statement

print(array[0][1])

? I don't think there's another way without using this kind of indexing

Answer 8

array={[1,2],[3,4]}
print(array[0][1])

The code above doesn’t return “2”, instead it returns a TypeError: unhashable type: ‘list’

Answer 9

Oladimeji Abdrahman MATOVU CALEB I checked the difference between list and set. It says:
A set is unordered and unindexed, and dosen’t allow duplicates.
A list is ordered.

How do you understand “ordered”? I kinda get confuse what is ordered/unordered? It seems I can put various type of data in a list as well, i.e.:
sample_list = [1, “red”, False, (0.5, 0.6, 0.7)]
It doesn’t look very order to me….

Answer 10

Walter Thank you for helping!

Answer 11

https://code.sololearn.com/ckzsUKEemw5p/?ref=app
https://code.sololearn.com/W8Mg7YqQGLtq/?ref=app

Answer 12

That makes sense. Thank you Matovu!

Answer 13

Actually, as [] is for array data type, {} is for set data type, so using that means you're declaring an entire different data type although there's a way it can also be access

Answer 14

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Answer 15

Irfan Ahmed whose wife you wanna hack? I won't recommend you hacking anyone's wife, to preserve world peace =)

Answer 16

静文 毛 happy to help =)

Answer 17

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