How to add numbers together from a string with words?

Question

I'm new to Python and I'm sure that there's a method to do this that I don't know about. I checked around for my question, and there are many similar ones but I didn't find exactly mine.

The string I have is:

"Arkansas 40\n Washington 83\n North Dakota 49\n New Jersey 24"

What I want to do is add just the numbers in the string together.

I've written a function that does this using the "try" statement, but "try" requires something to be written to the "except" portion of the indent, and I would just like it to simply discard any exceptions silently.

The output I'm looking for is:

196

(EDIT) Wow - there are a LOT of ways to do this, clearly. I picked the best answer for the very simple task I was trying to accomplish.

Mainly, what I needed to know about was "isdigit()", and when using try statements, the "pass" keyword for exception.

Answer 1

This works:

s = "Arkansas 40\n Washington 83\n North Dakota 49\n New Jersey 24"

sum(int(n) for n in s.split() if n.isdigit())

196

Basically the .isdigit() method does the trick here. No need for a try/except as if there are no numbers in the string, no n will meet the isdigit() condition, and sum will return 0.

Answer 2

>>> s = "Arkansas 40\n Washington 83\n North Dakota 49\n New Jersey 24"
>>> sum([int(x.split()[-1]) for x in s.split('\n')])
196

Answer 3

Something like this

import re
tot = 0
s = "Arkansas 40\n Washington 83\n North Dakota 49\n New Jersey 24"
for line in s.split('\n'):
    ma = re.search('(\d+)', line)
    if ma:
        tot += ma.group(1)
print tot

Answer 4

So what you need to do first is extract the numbers from the string. You can split the string out into chunks using String.split(), and then just test if each is a number by iterating through them, returning only the ones that are integers. For example, if you have the string s:

[int(i) for i in s.split('\n') if i.isdigit()]

will create an array of integers. Then all you have to do is sum them up, and there's your answer.

Answer 5

wonderful opportunity to abuse map,filter & reduce

print reduce(lambda x,y: x+y, 
             map(lambda x: int(x), 
                 filter(lambda x: x.isdigit(), 
                        re.split(' |\n',s))))