


Why Do I Get an IndexError in My \'for i in ar\' Loop When Summing List Values?
Nov 03, 2024 pm 01:44 PMIndexError in "for i in ar" Loop: Understanding the Iteration
When attempting to sum the values of a list using a for loop, one may encounter an IndexError, TypeError, or incorrect results. This error arises due to an incorrect usage of the list index.
Consider the following code:
<code class="python">def sumAnArray(ar): theSum = 0 for i in ar: theSum = theSum + ar[i] return theSum</code>
Here, we intend to loop through the list and accumulate the values in theSum. However, the code triggers an IndexError because i represents each element of the list, not its index.
To correctly loop through the list and access its elements, one should modify the code to:
<code class="python">def sumAnArray(ar): theSum = 0 for i in ar: theSum = theSum + i return theSum</code>
Alternatively, one can use a range to iterate over valid list indices:
<code class="python">def sumAnArray(ar): theSum = 0 for i in range(len(ar)): theSum = theSum + ar[i] return theSum</code>
These modifications ensure that i represents a valid index within the list, preventing the IndexError and enabling correct calculation of the sum.
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