Hex code in a traceback

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What does the hex code in a Python traceback mean?

For example, the following traceback is from accessing an out of bounds list index:

In [19]: c[100]
-------------------------------------------------------------------------
IndexError Traceback (most recent call last)
<ipython-input-18-9a31ea1e1a13> in <module>()
----> 1 c[100]

IndexError: list index out of range

What is "9a31ea1e1a13"?