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importnb imports notebooks as modules. Notebooks are reusable as tests, source code, importable modules, and command line utilities.

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pip install importnb

conda install -c conda-forge importnb

importnb for testing

After importnb is installed, pytest will discover and import notebooks as tests.

pytest index.ipynb

importnb imports notebooks as python modules, it does not compare outputs like nbval.

importnb now captures doctests in every Markdown cell & block string expression. The docstrings are tested with the --doctest-modules flag.

pytest index.ipynb --doctest-modules

It is recommended to use importnb with --nbval.

pytest index.ipynb --nbval

importnb for the commmand line

importnb can run notebooks as command line scripts. Any literal variable in the notebook, may be applied as a parameter from the command line.

ipython -m importnb -- index.ipynb --foo "A new value"

importnb for Python and IPython

It is suggested to execute importnb-install to make sure that notebooks for each IPython session.

Restart and run all or it didn't happen.

importnb excels in an interactive environment and if a notebook will Restart and Run All then it may reused as python code. The Notebook context manager will allow notebooks with valid names to import with Python.

>>> from importnb import Notebook

For brevity

    with __import__('importnb').Notebook(): 
        import readme

importnb.loader will find notebooks available anywhere along the sys.path.

or explicity

    from importnb import Notebook
    with Notebook(): 
        import readme
    foo = 42
    import readme
    assert is 42
    assert readme.__file__.endswith('.ipynb')

importnb readme

Modules may be reloaded

The context manager is required to reload a module.

    from importlib import reload
    with Notebook(): __name__ == '__main__' and reload(readme)

Lazy imports

The lazy option will delay the evaluation of a module until one of its attributes are accessed the first time.

    with Notebook(lazy=True):
        import readme

Fuzzy File Names

    if __name__ == '__main__':
        with Notebook():
            import __a_me
        assert __a_me.__file__ == readme.__file__

Python does not provide a way to import file names starting with numbers of contains special characters. importnb installs a fuzzy import logic to import files containing these edge cases.

import __2018__6_01_A_Blog_Post

will find the first file matching *2018*6?01?A?Blog?Post. Importing Untitled314519.ipynb could be supported with the query below.

import __314519


The first markdown cell will become the module docstring.

    if __name__ == '__main__':
__importnb__ imports notebooks as modules.  Notebooks are reusable as tests, source code, importable modules, and command line utilities.

Meaning non-code blocks can be executeb by doctest.

    if __name__ == '__main__':

Import notebooks from files

Notebook names may not be valid Python paths. In this case, use Notebook.from_filename.


Import under the __main__ context.


Parameterize Notebooks

Literal ast statements are converted to notebooks parameters.

In readme, foo is a parameter because it may be evaluated with ast.literal_val

    if __name__ == '__main__':
        from importnb import Parameterize
        f = Parameterize.load(readme.__file__)

The parameterized module is a callable that evaluates with different literal statements.

    if __name__ == '__main__': 
        assert callable(f)
assert f().foo == 42
assert f(foo='importnb').foo == 'importnb'

Run Notebooks from the command line

Run any notebook from the command line with importnb. Any parameterized expressions are available as parameters on the command line.

!ipython -m importnb -- index.ipynb --foo "The new value"



IPython Extension

Avoid the use of the context manager using loading importnb as IPython extension.

%load_ext importnb

%unload_ext importnb will unload the extension.

Default Extension

importnb may allow notebooks to import by default with


If you'd like to play with source code on binder then you must execute the command above. Toggle the markdown cell to a code cell and run it.

This extension will install a script into the default IPython profile startup that is called each time an IPython session is created.

Uninstall the extension with importnb-install.

Run a notebook as a module

When the default extension is loaded any notebook can be run from the command line. After the importnb extension is created notebooks can be execute from the command line.

ipython -m readme

In the command line context, __file__ == sys.arv[0] and __name__ == '__main__' .

See the deploy step in the travis build.

Parameterizable IPython commands

Installing the IPython extension allows notebooks to be computed from the command. The notebooks are parameterizable from the command line.

ipython -m readme -- --help


importnb installs a pytest plugin when it is setup. Any notebook obeying the py.test discovery conventions can be used in to pytest. This is great because notebooks are generally your first test.

!ipython -m pytest -- src 

Will find all the test notebooks and configurations as pytest would any Python file.


To package notebooks add recursive-include package_name *.ipynb


Format and test the Source Code

    if __name__ == '__main__':
        if globals().get('__file__', None) == __import__('sys').argv[0]:
            print(foo, __import__('sys').argv)
            from subprocess import call
            !ipython -m pytest
            from pathlib import Path
            from importnb.utils.export import export
            root = 'src/importnb/notebooks/'
            for path in Path(root).rglob("""*.ipynb"""):                
                if 'checkpoint' not in str(path):
                    export(path, Path('src/importnb') / path.with_suffix('.py').relative_to(root))
            !jupyter nbconvert --to markdown --stdout index.ipynb >
    if __name__ == '__main__':
            from IPython.display import display, Image
            from IPython.utils.capture import capture_output
            from IPython import get_ipython
            with capture_output(): 
                get_ipython().system("cd docs && pyreverse importnb -opng -pimportnb")
            display(Image(url='docs/classes_importnb.png', ))
        except: ...