feat(Python): Add Pyodide list support

packages/core/python/itkwasm/itkwasm/pyodide.py

@@ -61,7 +61,9 @@ def web_worker(self, value):
 
 def to_py(js_proxy):
     import pyodide
-    if hasattr(js_proxy, "imageType"):
+    if isinstance(js_proxy, pyodide.ffi.JsArray):
+        return [to_py(value) for value in js_proxy]
+    elif hasattr(js_proxy, "imageType"):
         image_dict = js_proxy.to_py()
         image_type = ImageType(**image_dict['imageType'])
         image_dict['imageType'] = image_type
@@ -142,7 +144,12 @@ def to_py(js_proxy):
 def to_js(py):
     import pyodide
     import js
-    if isinstance(py, Image):
+    if isinstance(py, list):
+        js_array = pyodide.ffi.to_js([])
+        for value in py:
+            js_array.append(to_js(value))
+        return js_array
+    elif isinstance(py, Image):
         image_dict = asdict(py)
         image_dict['direction'] = image_dict['direction'].ravel()
         if image_dict['data'] is not None:

packages/core/python/itkwasm/test/test_pyodide.py

@@ -256,3 +256,36 @@ async def test_text_file_conversion(selenium, package_wheel):
         data_py = fp.read()
 
     assert data_py == data
+
+@run_in_pyodide(packages=['micropip', 'numpy'])
+async def test_list_conversion(selenium, package_wheel):
+    import micropip
+    await micropip.install(package_wheel)
+
+    from itkwasm import TextFile
+    from itkwasm.pyodide import to_js, to_py
+    import numpy as np
+    from pathlib import PurePosixPath
+
+    data = "The answer is 42."
+
+    def create_text_file(index):
+        path = PurePosixPath(f'file{index}.txt')
+        with open(path, 'w') as fp:
+            fp.write(data)
+        text_file = TextFile(path)
+        return text_file
+
+    text_files = [create_text_file(index) for index in range(4)]
+
+    text_files_js = to_js(text_files)
+    text_files_py = to_py(text_files_js)
+
+    def verify_text_file(text_file):
+        with open(text_file.path, 'r') as fp:
+            data_py = fp.read()
+
+        assert data_py == data
+
+    for text_file in text_files_py:
+        verify_text_file(text_file)