If you have a list with 53 items, the last one is thelist[52]
because indexing starts at 0.
From Real Python: Understanding the Python Traceback – IndexError
:
IndexError
The IndexError
is raised when you attempt to retrieve an index from a sequence, like a list
or a tuple
, and the index isn’t found in the sequence. The Python documentation defines when this exception is raised:
Raised when a sequence subscript is out of range. (Source)
Here’s an example that raises the IndexError
:
test = list(range(53)) test[53] --------------------------------------------------------------------------- IndexError Traceback (most recent call last) <ipython-input-6-7879607f7f36> in <module> 1 test = list(range(53)) ----> 2 test[53] IndexError: list index out of range
The error message line for an
IndexError
doesn’t give you great information. You can see that you have a sequence reference that isout of range
and what the type of the sequence is, alist
in this case. That information, combined with the rest of the traceback, is usually enough to help you quickly identify how to fix the issue.