What is an "array"?

Python
1

In the Complete Python Mastery course, I have watched the “arrays” video…
But I quite didn’t understand it. And I think Mosh didn’t elaborate it much, and so I didn’t understand :cry: what exactly are arrays and how we use them in PYTHON

Thank you

2

Hi,
Can you tell me the section and the name of the episode that teaches about array in python course ?

3

Section: Data Structures
Video : Arrays

5

Sorry, but i don’t have access to that episode and i couldn’t found the array part in youtube :disappointed:

6

Watch the video here!
I recorded my screen :sweat_smile:

7

Hi Megha, I suggest you to visit this link, https://www.thoughtco.com/definition-of-arrays-in-mathematics-2312362
it is going to help you,

Regards,

Jose

8

Array is a data structure that we use to represent a list of item, but the use case in python is different.
As mosh said in python we usually use lists but if there is a problem in performance or if we’re dealing with a large list of numbers we use arrays because it takes less memory and has a faster performance.

so he imported array class from array module and then defined an array which takes two parameters the first one is about the type which can be a short, integer, float, double, long… and the second parameter is the array itself which is a list of items :disappointed:

from array import array // so from array module he imported array class

array("i", [1, 2, 3])

and after that you can use the methods of that array or you can simply log it using print

9

@jose_reano this is about arrays in mathematics!

10

Hi,
i got a problem here in Data strurctures, specially in part 1, Tutorial 4(Exercise Array in class), whenever i try to add new item or try to code the Array, this is going to happen

Arrays
Arrays1357×511 46 KB

so please help!
i have been trying for two days by my self but nothing worked

thanks in advance,
Sayidali.

12

No, you don’t.

@Zabeite First of all: Why are you posting a new Data Structures / Java question in an existing thread in the Python forum?

@Zabeite

  • Mosh named the class Array while you named it Arrays. So the compiler can’t find the Array class you try to use in Main.

  • You seem to have written the parameter names in front of the arguments. Instead of numbers.Insert(items:10) just write numbers.Insert(10).

  • There are syntax errors in your Arrays-class. Fix them before trying to use the class in Main.

1 Like
13

#first I’m sorrey for posting into a different content but, i was only referring to the Arrays which both courses contain.

although i took every step you mentioned, nothing worked as i expected, am still getiing the same error

image
image1366×714 66 KB

14

Look at the lower left window “Build Output”. It lists the errors you need to fix

  • don’t type parameter names. It’s new Array(3) not new Array(length:3)
  • you have a superfluous “.” in line 7

I’m not sure why your IDE colors the inserts in red. Maybe that’s the way it colors method calls, maybe you have a typo in your Array class. Look how you spelled insert there. Case counts.

15

In line 7 there are 2 dots and you’ve written the length parameter which is not right so you need to just type 10 and the word length will appear with a small grey text.

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Python Arrays