Added import_() method (also) to Node class.

mph/model.py

@@ -702,12 +702,13 @@ def import_(self, node, file):
         so that the Python parser does not treat the name as an
         `import` statement.
         """
-        file = Path(file)
-        log.info(f'Loading external data from file "{file.name}".')
-        node.java.discardData()
-        node.property('filename', f'{file}')
-        node.java.importData()
-        log.info('Finished loading external data.')
+        if isinstance(node, str):
+            node = self/node
+        if not node.exists():
+            error = f'Node "{node}" does not exist in model tree.'
+            log.error(error)
+            raise ValueError(error)
+        node.import_(file)
 
     def export(self, node=None, file=None):
         """

mph/node.py

@@ -366,6 +366,25 @@ def run(self):
             raise RuntimeError(error)
         java.run()
 
+    def import_(self, file):
+        """
+        Imports external data from the given `file`.
+
+        Note the trailing underscore in the method name. It is needed
+        so that the Python parser does not treat the name as an
+        `import` statement.
+        """
+        file = Path(file)
+        if not file.exists():
+            error = f'File "{file}" does not exist.'
+            log.error(error)
+            raise IOError(error)
+        log.info(f'Loading external data from file "{file.name}".')
+        self.property('filename', f'{file}')
+        self.java.discardData()
+        self.java.importData()
+        log.info('Finished loading external data.')
+
     def create(self, *arguments, name=None):
         """
         Creates a new child node.

tests/test_node.py

@@ -304,6 +304,12 @@ def test_run():
             Node(model, 'functions').run()
 
 
+def test_import():
+    # Skip here as we will test this for the `Model` class anyway and
+    # would have to create nodes first, which is the test to follow.
+    pass
+
+
 def test_create():
     functions = Node(model, 'functions')
     functions.create('Analytic')