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pythonjupyter-notebook
Olivier Verdier
Olivier Verdier

Reputation: 49196

What happens during a Jupyter notebook evaluation?

I've always thought that Jupyter simply printed out the repr of an object, but that is not the case.

Here is an example. If I evaluate this in a notebook:

obj = type(2)
obj

I just get: int.

If I do instead

print(obj)

I get: <class 'int'>.

So: what is the Python instruction to simulate what the notebook does during the evaluation of a variable?

Upvotes: 0

Views: 561

Answers (1)

MisterMiyagi
MisterMiyagi

Reputation: 51979

Jupyter/IPython uses a rather complex pretty printer. Concerning your example of int, it has a printer for classes/type.

Basically what it does is it gets the class' name via cls.__qualname__ (py3) or cls.__name__ (py2&3) and the module via cls.__module__, and prints them as <module.name>. For builtins, the module name is silently ignored.

Upvotes: 1

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