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Improve error tracebacks so that it shows the cell prompts
Improve error tracebacks so that it shows the cell prompts

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traceback-improvements.rst
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Traceback improvements
======================

Previously, error tracebacks for errors happening in code cells were showing a hash, the one used for compiling the Python AST.

In [1]: def foo():
...: return 3 / 0
...:

In [2]: foo()
---------------------------------------------------------------------------
ZeroDivisionError Traceback (most recent call last)
<ipython-input-2-c19b6d9633cf> in <module>
----> 1 foo()

<ipython-input-1-1595a74c32d5> in foo()
1 def foo():
----> 2 return 3 / 0
3

ZeroDivisionError: division by zero

The error traceback is now correctly formatted, showing the cell number in which the error happened:

In [1]: def foo():
...: return 3 / 0
...:

In [2]: foo()
---------------------------------------------------------------------------
ZeroDivisionError Traceback (most recent call last)
In [2], in <module>
----> 1 foo()

In [1], in foo()
1 def foo():
----> 2 return 3 / 0

ZeroDivisionError: division by zero