Update from debuggingbook

Author: andreas-zeller

notebooks/shared/bookutils/__init__.py

@@ -164,37 +164,10 @@ def show_ast(tree: AST) -> Optional[Any]:
         print(ast.dump(tree))
         return None
 
-    # show_ast() no longer works in Python 3.12: the `imp` module is deprecated
-    # import showast
-    # return showast.show_ast(tree)
-
-    # Workaround, avoiding `imp`
-    import_showast()
+    # Note: For Python >=3.12, this needs a patched `showast` module
+    # e.g. git+https://github.com/andreas-zeller/show_ast.git@andreas
     import showast
-    from showast.rendering.graphviz import render
-    return render(tree, showast.Settings)
-
-# Allow importing the showast module
-def import_showast() -> None:
-    try:
-        import showast
-        return
-    except ModuleNotFoundError:
-        pass
-
-    # Create a local (empty) 'imp' module while importing showast
-    # This is an ugly hack until the `showast` module is updated to 3.12
-    import os, sys, shutil
-    os.mkdir('imp')
-    imp_init = os.path.join('imp', '__init__.py')
-    with open(imp_init, 'w') as fd:
-        pass
-    original_sys_path = sys.path
-    sys.path = ['.'] + sys.path
-    import showast
-    sys.path = original_sys_path
-    shutil.rmtree('imp')
-
+    return showast.show_ast(tree)
 
 # Escaping unicode characters into ASCII for user-facing strings
 def unicode_escape(s: str, error: str = 'backslashreplace') -> str:

notebooks/shared/ipypublish/scripts/export_plugins.py

@@ -1,11 +1,31 @@
 import glob
-import imp
 import inspect
 import logging
 import os
 import uuid
 import warnings
 
+
+# Replacement for imp.load_source; see https://docs.python.org/3/whatsnew/3.12.html#imp
+import importlib.util
+import importlib.machinery
+
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname, filename, loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+# Alternative if the above code does not work
+# import imp
+# load_source = imp.load_source
+
+
+
 # py 2/3 compatibility
 try:
     import pathlib
@@ -22,7 +42,7 @@ def load_source(modname, fname):
         loader.exec_module(mod)
         return mod
 except ImportError as err:
-    load_source = lambda modname, fname: imp.load_source(modname, fname)
+    load_source = lambda modname, fname: load_source(modname, fname)
 
 from ipypublish import export_plugins