Getting numerical input list from user in python 3

Question

I am trying to make a simple calculator that calculates basic statistic functions. I am almost done but I cannot figure out how to make a user input a list of numerical values. This is where I am currently at:

#inputList code?
inputList = []
numbers = input('Input your numbers: ').split(',')
for entry in numbers:
    inputList.append(entry)

This gives me the error: TypeError: can't convert type 'str' to numerator/denominator Here is a link to all the code: http://pastebin.com/B7u5a6LA

Aside from the fact that it's really just inputList = input(...).split(','), the code you have provided works fine for me. Please provide a minimal example that actually recreates the issue. — jonrsharpe
– jonrsharpe, Commented Oct 15, 2014 at 15:00
Aside: in your linked code you forgot a bunch of return statements. Unlike some languages, Python doesn't automatically return the result of the last line executed in a function. — DSM
– DSM, Commented Oct 15, 2014 at 15:04
@DSM yes yes, now it works! I have forgotten to do that. Silly me. Thanks everybody for your answers. — Amr Okasha
– Amr Okasha, Commented Oct 15, 2014 at 15:12
@avi thank you, I used the inputList.append(int(entry)) and now it works. Thank you very much! — Amr Okasha
– Amr Okasha, Commented Oct 15, 2014 at 15:13
@aruisdante thank you, for editing my text and providing the solution. ^-^ — Amr Okasha
– Amr Okasha, Commented Oct 15, 2014 at 15:15

avi · Accepted Answer · 2014-10-15 15:05:05Z

2

Change those to int with int(some_string):

for entry in numbers:
    inputList.append(int(entry))

EDIT: As suggested by @tobias_k and @DSM, you can use map fucntions:

inputlist = list(map(int, numbers))

edited Oct 15, 2014 at 15:05

answered Oct 15, 2014 at 14:59

avi

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4 Comments

tobias_k Over a year ago

Or shorter: inputlist = map(int, numbers)

avi Over a year ago

added to the answer. Thanks for suggesting!

DSM Over a year ago

Careful: the question is tagged 3.x, and map doesn't return a list in 3. You'd need list(map(int, numbers)).

avi Over a year ago

oops, great catch. edited the answer. My mind still hung upon python 2.

aruisdante · Accepted Answer · 2014-10-15 15:00:57Z

0

Depending on how robust to bad input you want to be, you can do the following in one line to get it done:

inputList = [float(num.strip()) for num in input("Enter a list of numbers: ").split(',')]

Note that the user entering something that wasn't a number, or something that wasn't a comma delimited list of numbers, will cause this to throw a ValueError. If that is something you're worried about.

answered Oct 15, 2014 at 15:00

aruisdante

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