diff --git a/py2nb.py b/py2nb.py
index 7d6f6b0..fdf15e1 100755
--- a/py2nb.py
+++ b/py2nb.py
@@ -22,7 +22,7 @@
 # Comment syntax patterns
 CELL_SPLIT_CHARS = ['#-', '# -']
 MARKDOWN_CHARS = ['#|', '# |']
-COMMAND_CHARS = ['#!', '# !']
+COMMAND_CHARS = ['#!', '# !', '#%', '# %']
 ACCEPTED_CHARS = CELL_SPLIT_CHARS + MARKDOWN_CHARS + COMMAND_CHARS
 
 def new_cell(nb, cell_content, cell_type='code'):
@@ -90,8 +90,11 @@ def get_comment_type(line):
 def extract_content(line, comment_type):
     """Extract content from comment line based on type."""
     if comment_type == 'command':
-        # Find first ! and return ! plus everything after it
-        return '!' + line[line.index('!') + 1:].lstrip()
+        # Find first ! or % and return the command marker plus everything after it
+        if '!' in line:
+            return '!' + line[line.index('!') + 1:].lstrip()
+        elif '%' in line:
+            return '%' + line[line.index('%') + 1:].lstrip()
     elif comment_type == 'markdown':
         # Find first | and return everything after it  
         return line[line.index('|') + 1:]
diff --git a/test_py2nb.py b/test_py2nb.py
index 21e5194..00d40e8 100644
--- a/test_py2nb.py
+++ b/test_py2nb.py
@@ -99,6 +99,69 @@ def test_command_blocks(self):
         self.assertIn('command', command_cell.get('metadata', {}).get('tags', []))
         self.assertIn('!pip install numpy', ''.join(command_cell['source']))
 
+    def test_percent_command_blocks(self):
+        """Test command block creation with #% syntax."""
+        script_content = """#| # Test Percent Magic Commands
+
+#% matplotlib inline
+#% load_ext autoreload
+#% autoreload 2
+
+import numpy as np
+import matplotlib.pyplot as plt"""
+        
+        script_path = self.create_test_script(script_content)
+        notebook_path = py2nb.convert(script_path)
+        
+        with open(notebook_path, 'r') as f:
+            nb = json.load(f)
+        
+        # Should have: markdown, command, code cells
+        self.assertEqual(len(nb['cells']), 3)
+        self.assertEqual(nb['cells'][0]['cell_type'], 'markdown')
+        self.assertEqual(nb['cells'][1]['cell_type'], 'code')
+        self.assertEqual(nb['cells'][2]['cell_type'], 'code')
+        
+        # Check command cell has command tag
+        command_cell = nb['cells'][1]
+        self.assertIn('command', command_cell.get('metadata', {}).get('tags', []))
+        self.assertIn('%matplotlib inline', ''.join(command_cell['source']))
+        self.assertIn('%load_ext autoreload', ''.join(command_cell['source']))
+
+    def test_mixed_command_types(self):
+        """Test mixing #! and #% command types."""
+        script_content = """#| # Mixed Command Types Test
+
+#! pip install numpy
+#% matplotlib inline
+#% load_ext autoreload
+#! pip install matplotlib
+#% autoreload 2
+
+import numpy as np"""
+        
+        script_path = self.create_test_script(script_content)
+        notebook_path = py2nb.convert(script_path)
+        
+        with open(notebook_path, 'r') as f:
+            nb = json.load(f)
+        
+        # Should have: markdown, command, code cells
+        self.assertEqual(len(nb['cells']), 3)
+        self.assertEqual(nb['cells'][0]['cell_type'], 'markdown')
+        self.assertEqual(nb['cells'][1]['cell_type'], 'code')
+        self.assertEqual(nb['cells'][2]['cell_type'], 'code')
+        
+        # Check command cell contains both ! and % commands
+        command_cell = nb['cells'][1]
+        self.assertIn('command', command_cell.get('metadata', {}).get('tags', []))
+        command_source = ''.join(command_cell['source'])
+        self.assertIn('!pip install numpy', command_source)
+        self.assertIn('%matplotlib inline', command_source)
+        self.assertIn('%load_ext autoreload', command_source)
+        self.assertIn('!pip install matplotlib', command_source)
+        self.assertIn('%autoreload 2', command_source)
+
     def test_cell_splits(self):
         """Test code cell splitting with #- syntax."""
         script_content = """x = 1
@@ -125,6 +188,7 @@ def test_mixed_syntax(self):
 #| This tests all comment types together
 
 #! pip install numpy
+#% matplotlib inline
 
 import numpy as np
 
@@ -135,6 +199,7 @@ def test_mixed_syntax(self):
 #-
 
 #! pip install matplotlib
+#% load_ext autoreload
 
 import matplotlib.pyplot as plt
 plt.plot(x)"""
@@ -206,6 +271,8 @@ def test_comment_type_detection(self):
         self.assertEqual(py2nb.get_comment_type('# | markdown'), 'markdown')
         self.assertEqual(py2nb.get_comment_type('#! install'), 'command')
         self.assertEqual(py2nb.get_comment_type('# ! install'), 'command')
+        self.assertEqual(py2nb.get_comment_type('#% magic'), 'command')
+        self.assertEqual(py2nb.get_comment_type('# % magic'), 'command')
         self.assertEqual(py2nb.get_comment_type('#- split'), 'split')
         self.assertEqual(py2nb.get_comment_type('# - split'), 'split')
         self.assertIsNone(py2nb.get_comment_type('# regular comment'))
@@ -214,7 +281,9 @@ def test_content_extraction(self):
         """Test content extraction from comment lines."""
         self.assertEqual(py2nb.extract_content('#| markdown text', 'markdown'), ' markdown text')
         self.assertEqual(py2nb.extract_content('#! pip install numpy', 'command'), '!pip install numpy')
+        self.assertEqual(py2nb.extract_content('#% matplotlib inline', 'command'), '%matplotlib inline')
         self.assertEqual(py2nb.extract_content('# | spaced markdown', 'markdown'), ' spaced markdown')
+        self.assertEqual(py2nb.extract_content('# % config InlineBackend', 'command'), '%config InlineBackend')
 
     def test_file_not_found(self):
         """Test handling of non-existent files."""