Convert a string of numbers to a list of integers. Python

Question

I am trying to convert the string str1 to a list of numbers so that I could sum them up. First I use the split() function to make sense of the numbers in str1, I cast the string into a list (lista) and after that I use the map() function in order to convert the strings in the new list to integers:

   str1="13,22,32,4,5"

   str2=str1.split()
   lista=list(str2)

   lista=map(int,lista)

   print sum(lista)

For some reason I get the following error message: "ValueError: invalid literal for int() with base 10: '13,22,32,4,5'"

jonrsharpe · Accepted Answer · 2014-01-09 17:10:20Z

2

Using split() will not split up str1, as without the sep argument the default separator is a space ' '. Hence:

str2 == ["13,22,32,4,5"]

you need to specify that split should use a comma ','. In fact, you can combine your operations into one:

sum(map(int, str1.split(',')))

answered Jan 9, 2014 at 17:10

jonrsharpe

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2 Comments

Reboot_87 Over a year ago

I see what you did there. I managed to make mine work only by adding (",") to the split function parentheses. Thank you!

jonrsharpe Over a year ago

You don't need to call lista = list(str2); split returns a list, so you can use lista = str1.split(',')

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