Simple way to create an incrementing Python array

Question

I am wanting to initialize an array (in Python) that goes from 1 to some number n. I am wondering how I would do that in the simplest way...

In this answer, they share a way to initialize an array with all the same value, but I want to initialize mine to be more like this: [1,2,3,4,5,6,7,8,9,10] if n = 10

I know I could do something like:

n = int(input("Enter a number: "))

arr = 0 * n

for (i in range(len(arr))):
    arr[i] = i+1

But I want it simpler... I'm sort of new to Python, so I don't know a whole lot. Would someone be able to show me how (and explain it or give a reference) to initialize an "incrementing array"?

Thank you!

Karl Knechtel · Accepted Answer · 2020-11-22 03:54:56Z

4

But I want it simpler

Make sure you understand how range works and what it actually does. Since it is already a sequence, and since it already contains the exact values you want, all you need to do in order to get a list is to convert the type, by creating a list from the range.

It looks like:

list(range(n))

Yep, that's it.

answered Nov 22, 2020 at 3:54

Karl Knechtel

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4 Comments

Karl Knechtel Over a year ago

Notice that the documentation does this same thing in multiple examples, specifically to show what numbers the example ranges contain. printing a range directly is possible, but what it gives you is not especially useful unless you already understand.

rioV8 Over a year ago

list(range(1,n+1))

Karl Knechtel Over a year ago

True, but it's better to get used to the idea of starting to count from 0 :)

Jacob Hornbeck Over a year ago

@KarlKnechtel - That is a very simple solution! Thank you!

apridos · Accepted Answer · 2020-11-22 03:58:47Z

1

Update Based on Karl's answer, you should have something like this :

arr = list(range(1, n+1))
print(arr)

======================================================= I'm not really sure about your question. but let me try

n = int(input("Enter a number: "))
arr = []
for i in range (1,n+1):
    arr.append(i)
print(arr)

use append to add any item to the tail of the array.

answered Nov 22, 2020 at 3:58

apridos

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