Fixed empty generated markdown files due to issue #57

Inherently also fixed issue #69
Some whitespace removal.

Author: ltan10

src/lazydocs/generation.py

@@ -220,7 +220,7 @@ def to_md_file(
         return
 
     md_file = filename
-    
+
     if is_mdx:
         if not filename.endswith(".mdx"):
             md_file = filename + ".mdx"
@@ -614,7 +614,7 @@ def func2md(self, func: Callable, clsname: str = "", depth: int = 3, is_mdx: boo
         if path:
             if is_mdx:
                 markdown = _MDX_SOURCE_BADGE_TEMPLATE.format(path=path) + markdown
-            else:    
+            else:
                 markdown = _SOURCE_BADGE_TEMPLATE.format(path=path) + markdown
 
         return markdown
@@ -998,8 +998,13 @@ def generate_docs(
                     continue
 
                 try:
-                    mod_spec = loader.find_spec(module_name)
-                    mod = importlib.util.module_from_spec(mod_spec)
+                    try:
+                        mod_spec = loader.find_spec(module_name)
+                        mod = importlib.util.module_from_spec(mod_spec)
+                        mod_spec.loader.exec_module(mod)
+                    except AttributeError:
+                        # For older python version compatibility
+                        mod = loader.find_module(module_name).load_module(module_name)  # type: ignore
                     module_md = generator.module2md(mod, is_mdx=is_mdx)
                     if not module_md:
                         # Module md is empty -> ignore module and all submodules
@@ -1077,8 +1082,13 @@ def generate_docs(
                             continue
 
                         try:
-                            mod_spec = loader.find_spec(module_name)
-                            mod = importlib.util.module_from_spec(mod_spec)
+                            try:
+                                mod_spec = loader.find_spec(module_name)
+                                mod = importlib.util.module_from_spec(mod_spec)
+                                mod_spec.loader.exec_module(mod)
+                            except AttributeError:
+                                # For older python version compatibility
+                                mod = loader.find_module(module_name).load_module(module_name)  # type: ignore
                             module_md = generator.module2md(mod, is_mdx=is_mdx)
 
                             if not module_md: