How does IPython's magic %paste work?

Question

I want to copy already indented Python code / whole functions and classes into IPython. Everytime I try the indentation is screwed up and I get following error message:

Answer 1

For ubuntu users who are on Python 3.

The python-tk is for Python 2.

To make %paste work on Python 3, install the python3-tk package:

sudo apt-get install python3-tk