IndexError: list index out of range – How to Resolve it in Python

Hi friends, in this post, we will be discussing about, how you can easily resolve the “IndexError: list index out of range” error when coding in Python. This is a common runtime error message you might get under certain circumstances, when coding in Python.

 

Reproducing the “IndexError” Python Error

In order to better understand the conditions under which we can get this runtime error, let’s reproduce it via an example.

To this end, let’s try to execute the following command in Python:

vehicles=["car", "train", "bike"]
print(vehicles[1])
print(vehicles[2])
print(vehicles[3])

If we execute the above code in Python, we will get the following runtime error:

print(vehicles[3])
IndexError: list index out of range

 

How to Resolve the Error

In order to resolve the above (and similar) errors, first we need to clearly understand that, the numbering of elements in an array, begins from 0 (not 1).

Therefore, in the above array, the index begins from 0 and goes up to 2, since there are 3 elements in the array. That means that, in the specific example, if we enter an index number above 2, we will get the “list index out of range” error.

To this end, the correct way of referencing the array’s elements is:

  • vehicles[0]
  • vehicles[1]
  • vehicles[2]

So, if we change the previous code example as per the below new example, our Python code won’t be generating a runtime error:

vehicles=["car", "train", "bike"]
print(vehicles[0])
print(vehicles[1])
print(vehicles[2])

 

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