stop executing cells programatically

[John Marino]

As I develop a notebook, I like to store tester code down at the bottom.  But this means I can't Run All or Run All Below without the tester code running.  (Yes, I can scroll down and Run All Above.)  Is there something I can enter into a cell that would keep the notebook from continuing to run cells?  I don't want to halt the kernel or interrupt what is running (i.e. I don't want an exception thrown).  I'm thinking a magic, e.g. %stop, would do the trick.  (I looked at the existing magics, but didn't find anything like this.)

[Paul Hobson]

One option would be raise an exception in a new cell above your tester cell.

Another option would be to a variable defined in the notebooks first cell (TESTING=False). You can then wrap your tests in an if testing: block, setting testing to True if you actually want them to run.

On Wed, Feb 15, 2017 at 12:11 PM, John Marino <john.d...@gmail.com> wrote:

As I develop a notebook, I like to store tester code down at the bottom.  But this means I can't Run All or Run All Below without the tester code running.  (Yes, I can scroll down and Run All Above.)  Is there something I can enter into a cell that would keep the notebook from continuing to run cells?  I don't want to halt the kernel or interrupt what is running (i.e. I don't want an exception thrown).  I'm thinking a magic, e.g. %stop, would do the trick.  (I looked at the existing magics, but didn't find anything like this.)

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[John Marino]

It's ugly, but it works:

# don't go beyond here with Run All

assert False

[Nick Mowry]

My search turned up this thread while trying to find an alternative to your second suggestion of using a  boolean toggle. This works fine for the most part, and I use it often. However, I cannot display the contents of a pandas data frame the way I'd like to from within the "if block". To follow your code,

include pandas as pd

data = pd.read_excel(xlsPath + xlsFile)

TESTING = True

# this shows all data with no formatting,

print(data)

# this formats the data into a table and displays it

# (how I'd like it to look),

data

# but when I try this, I get no output whatsoever.

if TESTING:

    data

Here's my version information. Any suggestions would be greatly appreciated. I'm wondering if this may be a bug in the pandas library?

Server Information:

You are using Jupyter notebook.

The version of the notebook server is: 5.7.4
The server is running on this version of Python:

Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:27:44) [MSC v.1900 64 bit (AMD64)]

Current Kernel Information:

Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:27:44) [MSC v.1900 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 7.3.0 -- An enhanced Interactive Python. Type '?' for help.

On Wednesday, February 15, 2017 at 3:44:07 PM UTC-5, Paul Hobson wrote:

One option would be raise an exception in a new cell above your tester cell.

Another option would be to a variable defined in the notebooks first cell (TESTING=False). You can then wrap your tests in an if testing: block, setting testing to True if you actually want them to run.

On Wed, Feb 15, 2017 at 12:11 PM, John Marino <john.d...@gmail.com> wrote:

As I develop a notebook, I like to store tester code down at the bottom.  But this means I can't Run All or Run All Below without the tester code running.  (Yes, I can scroll down and Run All Above.)  Is there something I can enter into a cell that would keep the notebook from continuing to run cells?  I don't want to halt the kernel or interrupt what is running (i.e. I don't want an exception thrown).  I'm thinking a magic, e.g. %stop, would do the trick.  (I looked at the existing magics, but didn't find anything like this.)

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[Paul Hobson]

You could try the built-in `print` function or ipython's display module.

Give this a look too: https://qgrid.readthedocs.io/en/latest/

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[Roland Weber]

Use the ternary operator as the last statement in the cell...

data if TESTING else None