CODEWITHSUNDEEP
pythonlistindexing
I.A.S.
I.A.S.

Reputation: 81

Index Error: List Appending Syntax Python

I'm having problems with this block of code:

while numSelector <= len(nums)+1:
    average = average + nums[numSelector]
    numSelector += 1

and I'm getting this error from the code:

Traceback (most recent call last): File "C:\Users\nghia_000\Documents\Programming\Python27\AveragingCalculator.py", line 11, in average = average + nums[numSelector] IndexError: list index out of range

Any idea how to fix this?

Upvotes: 0

Views: 91

Answers (3)

Vineesh
Vineesh

Reputation: 263

Changing the condition to numSelector <= len(nums)-1 or numSelector < len(nums) will do for you.

Upvotes: 0

Eli Rose
Eli Rose

Reputation: 6998

Suppose len(nums) == 5. Then the line:

while numSelector <= len(nums) + 1:

means "keep going until numSelector is no more than 6. But numSelector only has five elements in it -- 0, 1, 2, 3, 4.

Upvotes: 0

Divij Bindlish
Divij Bindlish

Reputation: 325

If the length of a list is n, then it contains elements at indices 0 to n-1. Try:

numSelector = 0
while numSelector < len(nums):
    average = average + nums[numSelector]
    numSelector += 1

A better way would be to directly iterate over the numbers present in the list using a for loop:

for num in nums:
    average += num

Upvotes: 4

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