Use The Underscore in The REPL

You can obtain the result of the last expression in a Python REPL with the underscore operator, e.g. in the Python REPL this looks like:

>>> 3 * 3
>>> _ + 3

This works in the IPython shell too. In addition, the IPython shell allows you to use Out[n] to get the value of the expression In[n]. E.g., Out[1] would give us the number 9 in the example below:

In [1]: 3 * 3
Out[1]: 9

In [2]: Out[1] + 3
Out[2]: 12

In [3]: _ + 3
Out[3]: 15

Please help us and share this article

About the author

Erik is the owner of Python Land and the author of many of the articles and tutorials on this website. He's been working as a professional software developer for 25 years, and he holds a Master of Science degree in computer science. His favorite language of choice: Python!

Leave a Comment