Create nbimport.py

Author: Frank Zickert

libs/nbimport.py

@@ -0,0 +1,87 @@
+
+import io, os, sys, types
+from IPython import get_ipython
+from nbformat import read
+from IPython.core.interactiveshell import InteractiveShell
+
+class NotebookLoader(object):
+    def __init__(self, path=None):
+        self.shell = InteractiveShell.instance()
+        self.path = path
+
+    def load_module(self, fullname):
+        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':
+                if "importable" not in cell.metadata.keys() or cell.metadata["importable"] == "True":
+                    # 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 mod
+
+
+def 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]
+    nb_path='.'
+    if not path:
+        path = ['']
+
+    for d in path:
+        nb_path = os.path.join(nb_path, d)
+
+    for f in filter(lambda x: x.endswith(".ipynb"), os.listdir(nb_path)):
+        if f[:f.find(".ipynb")] == name:
+            return os.path.join(f)
+
+
+class NotebookFinder(object):
+    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())
+