# few functions that make it possible to import functions# from jupyter notebooks as from modules;# source: http://jupyter-notebook.readthedocs.io/en/latest/examples/Notebook/Importing%20Notebooks.htmlimport io, os, sys, typesfrom IPython import get_ipythonfrom nbformat import readfrom IPython.core.interactiveshell import InteractiveShelldef find_notebook(fullname, path=None):    """find a notebook, given its fully qualified name and an optional path    This turns "foo.bar" into "foo/bar.ipynb"    and tries turning "Foo_Bar" into "Foo Bar" if Foo_Bar    does not exist.    """    name = fullname.rsplit('.', 1)[-1]    if not path:        path = ['']    for d in path:        nb_path = os.path.join(d, name + ".ipynb")        if os.path.isfile(nb_path):            return nb_path        # let import Notebook_Name find "Notebook Name.ipynb"        nb_path = nb_path.replace("_", " ")        if os.path.isfile(nb_path):            return nb_pathclass NotebookLoader(object):    """Module Loader for Jupyter Notebooks"""    def __init__(self, path=None):        self.shell = InteractiveShell.instance()        self.path = path    def load_module(self, fullname):        """import a notebook as a module"""        path = find_notebook(fullname, self.path)        #print ("importing Jupyter notebook from %s" % path)        # load the notebook object        with io.open(path, 'r', encoding='utf-8') as f:            nb = read(f, 4)        # create the module and add it to sys.modules        # if name in sys.modules:        #    return sys.modules[name]        mod = types.ModuleType(fullname)        mod.__file__ = path        mod.__loader__ = self        mod.__dict__['get_ipython'] = get_ipython        sys.modules[fullname] = mod        # extra work to ensure that magics that would affect the user_ns        # actually affect the notebook module's ns        save_user_ns = self.shell.user_ns        self.shell.user_ns = mod.__dict__        try:            for cell in nb.cells:                if cell.cell_type == 'code':                    # transform the input to executable Python                    code = self.shell.input_transformer_manager.transform_cell(cell.source)                    # run the code in themodule                    exec(code, mod.__dict__)        finally:            self.shell.user_ns = save_user_ns        return modclass NotebookFinder(object):    """Module finder that locates Jupyter Notebooks"""    def __init__(self):        self.loaders = {}    def find_module(self, fullname, path=None):        nb_path = find_notebook(fullname, path)        if not nb_path:            return        key = path        if path:            # lists aren't hashable            key = os.path.sep.join(path)        if key not in self.loaders:            self.loaders[key] = NotebookLoader(path)        return self.loaders[key]sys.meta_path.append(NotebookFinder())