I am very super new at Python and I've run into a problem. I'm trying to convert a string of numbers into an int or float so that I can add them up. This is my first question/post. Any suggestions are greatly appreciated!
total = 0
s = '2, 3.4, 5, 3, 6.2, 4, 7'
for i in s:
total += int(i)
print total
I get the errors:
*3
4 for i in s:
----> 5 total += int(i)
6 print total
ValueError: invalid literal for int() with base 10: ','*
You'll want to split the string at the commas using str.split. Then, convert them to floats (I don't know why you're using int when you say that you want to convert them to "an int or float").
total = 0
s = '2, 3.4, 5, 3, 6.2, 4, 7'
for i in s.split(','):
total += float(i)
print total
Personally, I would prefer to do this with a generator expression:
s = '2, 3.4, 5, 3, 6.2, 4, 7'
total = sum(float(i) for i in s.split(','))
print total
The reason what you're doing doesn't work is that for i in s iterates over each individual character of s. So first it does total += int('2'), which works. But then it tries total += int(','), which obviously doesn't work.
replace(',', ' ').split() because it also allows the numbers in the string to simply be space-separated -- so a shorter ones like '2 3.4 5 3 6.2 4 7' and '2,3.4,5,3,6.2,4,7'also work.You have a string of comma separated float values and not int. You need to split them first and then add them. You need to cast it to float and not int
total = 0
s = '2, 3.4, 5, 3, 6.2, 4, 7'
for i in s.split(','):
total += float(i)
print total
Output will be 30.6
How about this? (^_^)
In[3]: s = '2, 3.4, 5, 3, 6.2, 4, 7'
In[4]: s = s.replace(",","+") # s = '2+ 3.4+ 5+ 3+ 6.2+ 4+ 7'
In[5]: total = eval(s)
In[6]: print(total)
30.6
eval .. It is very wrong to do so. See nedbatchelder.com/blog/201206/eval_really_is_dangerous.html . Use import ast; total = ast.literal_eval(s) instead
ast.literal_eval() won't evaluate the + operators. But you can use sum() on the output of evaluating s as literals: sum(ast.literal_eval(s)).You want to split the string
total = 0
for i in s.split(','):
i = float(i) #using float because you don't only have integers
total += i
Here is my approach.
total = 0
s = '2, 3.4, 5, 3, 6.2, 4, 7'
lst = s.split(',');
for i in lst:
i = float(i)
total += i
print total
