So, I have 8 randomly generated numbers, all referenced with ct[i]. I want to add a number (ct[i]) with the one referenced by ct[i+1]. However, this produces a list index out of range error. What's wrong?
for i in range(totrange):
tot1 = ct[i] + ct[i+1]
totrange is usually 8, but I wanted to have a bit of flexibility.
You should probably use range(len(ct)-1) to handle this issue, as for the last i, i+1 is a value which is greater than the last index of ct.
examples:
In [30]: ct=range(5) #ct =[0,1,2,3,4]
In [31]: for i in range(len(ct)-1):
print(ct[i]+ct[i+1])
....:
1
3
5
7
or better use a zip() based solution, no need of using indexes at all:
In [32]: for x,y in zip(ct,ct[1:]):
print (x+y)
....:
1
3
5
7
If totrange is 8 and ct contains 8 elements, the last ct[i+1] call will try to get the 9th element from ct, causing a list index out of range error.
Because of this, totrange should never be greater than len(ct) - 1.
totrange should never be greater than len(ct)-1" (so that i is never greater than len(ct)-2) ?
len([0, 1]) is 2, which means that (len([0, 1]) - 1) + 1 is 2, which is an index out of range. (len([0, 1]) - 2) + 1 is 1 and will thus not be out of range.range(totrange) part. If totrange is len(ct)-1 (i.e. 7), i greatest value will be 6, and 6+1 is a valid ct index.
ctto... what? Wheniis7(which it will be iftotrangeis usually8),ct[i+1]will be out of bounds.