CODEWITHSUNDEEP
pythonlistsum
learnpy
learnpy

Reputation: 1

Sum of lists generated by for loop that has percentage signs in them?

I have a list that changes within a for loop. This is an example of one of the lists:

lst = ['1.50%', '2.67%']

I want to be able to take the sum of this list and the length so that I can find the average. I performed the following operation:

sum(lst)/len(lst)

When printed, I receive an error.

I am wondering if I can take the percentage out of every input in the list, convert it to an integer, and execute the preceding function once more to see if it works.

How should I go about doing this? Also, if there is an easier way, how should I proceed with such a step?

Upvotes: 0

Views: 69

Answers (2)

Sara Santana
Sara Santana

Reputation: 1019

try this code:

lst = ['1.50%', '2.67%']
lst2=[]
for i in lst:
     lst2.append(float(i[0:-1]))
print(sum(lst2)/len(lst2))

Upvotes: 0

Martijn Pieters
Martijn Pieters

Reputation: 1122252

You need to strip the percent sign and convert the remainder to float, as you cannot meaningfully sum strings:

sum(float(v.rstrip('%')) for v in lst) / len(lst)

Demo:

>>> lst = ['1.50%', '2.67%']
>>> sum(float(v.rstrip('%')) for v in lst) / len(lst)
2.085

Upvotes: 4

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