How is user input converted into a list with Python?

Question

d_num = []
d_num.append(input("Enter a figure to verify if is a Disarium number: "))

With the above code, an input of 135 and print(d_num), would return '135' opposed to '1, 3, 5'.

A quick-fix would be, prompt the user to include whitespace or other characters between digits and use the split command. However, that poses a problem because the output calculation is based upon the index of the digit.

For example:

input: 135 output: true, 135 == Disarium number as 1^1 + 3^2 + 5^3 = 135

Is there an easier way to convert user input, despite type, into a list?

list(input('enter something'))? It's not clear to me how you want to proceed after that. — roganjosh
– roganjosh, Commented Sep 30, 2018 at 19:33
I'm not sure how/ why but the output for the code you provided: enter something: 123 <class 'list'> — qdqshred
– qdqshred, Commented Sep 30, 2018 at 19:36

Anoop Nair · Accepted Answer · 2018-10-01 05:05:44Z

1

You wanted to know a way to automatically store each digit of the user input as a list item right? Below is the easiest way I can think of:

user_input = input("Enter a figure to verify if is a Disarium number: ")
d_num = [digit for digit in user_input]

The d_num list will have each digit stored separately and then you can convert it into an integer/float and perform the calculation to identify if its a Disarium number or not.

As @Jérôme suggested in the comment, a much simpler solution would be to simply convert the user input to a list and python handles the work of adding individual characters as a list item.

d_num = [digit for digit in user_input] can be written as d_num = list(user_input)

Hope that helps

edited Oct 1, 2018 at 5:05

answered Sep 30, 2018 at 19:42

Anoop Nair

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2 Comments

qdqshred Over a year ago

I've never heard of the enumerate command. And although that allows for a much more elegant solution to my problem than I was envisioning. Your response has perfectly handled what I asked and I appreciate it :)

Jérôme Over a year ago

d_num = [digit for digit in user_input] can be written list(user_input).

Mureinik · Accepted Answer · 2018-09-30 19:52:24Z

1

Calling list(d_num) will give you a list of the individual characters that make up the number. From there, you can just go over them, convert them to integers and raise them to the appropriate power:

if int(d_num) == sum((int(d[1])**(d[0] + 1) for d in enumerate(list(d_num)))):
    print("%s is a Disarium number" % d_num)

EDIT:
As Jean-François Fabre commented, you don't actually need the list call - you could enumerate the string's characters directly:

if int(d_num) == sum((int(d[1])**(d[0] + 1) for d in enumerate(d_num))):
    print("%s is a Disarium number" % d_num)

edited Sep 30, 2018 at 19:52

answered Sep 30, 2018 at 19:38

Mureinik

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3 Comments

Jean-François Fabre Over a year ago

I think you can drop list conversion here: enumerate(list(d_num)) => enumerate(d_num). enumerate knows how to iterate on characters of a string already.

Mureinik Over a year ago

@Jean-FrançoisFabre nice catch, thanks! Edited that in to my answer (with the proper attribution, of course)

Jean-François Fabre Over a year ago

wasn't asking that, but okay :)

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