T-Dot1992 - 1 year ago 50

Python Question

My prof wants me to create a function that return the sum of numbers in a string but without using any lists or list methods.

The function should look like this when operating:

`>>> sum_numbers('34 3 542 11')`

590

Usually a function like this would be easy to create when using lists and list methods. But trying to do so without using them is a nightmare.

I tried the following code but they don't work:

`>>> def sum_numbers(s):`

for i in range(len(s)):

int(i)

total = s[i] + s[i]

return total

>>> sum_numbers('1 2 3')

'11'

Instead of getting 1, 2, and 3 all converted into integers and added together, I instead get the string '11'. In other words, the numbers in the string still have not been converted to integers.

I also tried using a

`map()`

`>>> def sum_numbers(s):`

for i in range(len(s)):

map(int, s[i])

total = s[i] + s[i]

return total

>>> sum_numbers('1 2 3')

'11'

Answer Source

Totally silly of course, but for fun:

```
s = '34 3 542 11'
n = ""; total = 0
for c in s:
if c == " ":
total = total + int(n)
n = ""
else:
n = n + c
# add the last number
total = total + int(n)
print(total)
> 590
```

This assumes all characters (apart from whitespaces) are figures.