Core Kernel Implementation

class IPythonKernel:
    """
    Main IPython kernel implementation.
    
    Handles code execution, completion, introspection, and maintains
    execution state for interactive Python computing.
    """
    
    def do_execute(self, code, silent=False, store_history=True, 
                   user_expressions=None, allow_stdin=None):
        """
        Execute Python code in the kernel.
        
        Parameters:
        - code (str): Python code to execute
        - silent (bool): If True, don't broadcast output
        - store_history (bool): Whether to store in execution history
        - user_expressions (dict, optional): Expressions to evaluate
        - allow_stdin (bool, optional): Whether to allow stdin requests
        
        Returns:
        dict: Execution result with status, execution_count, etc.
        """
    
    def do_complete(self, code, cursor_pos):
        """
        Generate code completion suggestions.
        
        Parameters:
        - code (str): Code context for completion
        - cursor_pos (int): Cursor position in code
        
        Returns:
        dict: Completion results with matches, cursor positions
        """
    
    def do_inspect(self, code, cursor_pos, detail_level=0):
        """
        Inspect objects and provide documentation.
        
        Parameters:
        - code (str): Code containing object to inspect
        - cursor_pos (int): Cursor position in code
        - detail_level (int): Level of detail (0=brief, 1=detailed)
        
        Returns:
        dict: Inspection results with documentation, source, etc.
        """
    
    def do_history(self, hist_access_type, output, raw, session=None, 
                   start=None, stop=None, n=None, pattern=None, unique=False):
        """
        Access execution history.
        
        Parameters:
        - hist_access_type (str): Type of history access
        - output (bool): Include output in results
        - raw (bool): Return raw input or processed
        - session (int, optional): Session number
        - start (int, optional): Start line number
        - stop (int, optional): Stop line number  
        - n (int, optional): Number of entries
        - pattern (str, optional): Search pattern
        - unique (bool): Remove duplicates
        
        Returns:
        dict: History entries matching criteria
        """
    
    def do_is_complete(self, code):
        """
        Check if code is complete or needs more input.
        
        Parameters:
        - code (str): Code to check for completeness
        
        Returns:
        dict: Status indicating complete, incomplete, invalid, or unknown
        """
    
    def do_shutdown(self, restart):
        """
        Shutdown the kernel.
        
        Parameters:
        - restart (bool): Whether this is a restart
        
        Returns:
        dict: Shutdown confirmation
        """
    
    # Kernel state attributes
    execution_count: int    # Current execution count
    user_ns: dict          # User namespace for code execution
    shell: object          # IPython shell instance

class Kernel:
    """
    Base kernel class providing fundamental kernel functionality.
    
    Implements the Jupyter kernel protocol and provides the framework
    for message handling and kernel lifecycle management.
    """
    
    def start(self):
        """Start the kernel's main event loop."""
    
    def record_ports(self, ports):
        """
        Record the ports being used by this kernel.
        
        Parameters:
        - ports (dict): Dictionary of port names to port numbers
        """
    
    # Protocol version information
    protocol_version: str
    protocol_version_info: tuple
    
    # Kernel identification
    kernel_info: dict      # Kernel metadata and capabilities
    banner: str           # Kernel banner text

# Backward compatibility alias
Kernel = IPythonKernel  # Alias for IPythonKernel

from ipykernel.ipkernel import IPythonKernel

# Create kernel instance (typically done by framework)
kernel = IPythonKernel()

# Execute code
result = kernel.do_execute("print('Hello, World!')")
print(f"Execution count: {result['execution_count']}")
print(f"Status: {result['status']}")

# Get completion suggestions
completions = kernel.do_complete("import num", 10)
print(f"Matches: {completions['matches']}")

# Inspect an object
inspection = kernel.do_inspect("len", 3, detail_level=1)
if inspection['found']:
    print(f"Documentation: {inspection['data']['text/plain']}")

from ipykernel.ipkernel import IPythonKernel

kernel = IPythonKernel()

# Check if code is complete
complete_code = "x = 1"
result = kernel.do_is_complete(complete_code)
print(f"Status: {result['status']}")  # 'complete'

# Check incomplete code
incomplete_code = "if True:"
result = kernel.do_is_complete(incomplete_code)
print(f"Status: {result['status']}")  # 'incomplete'
print(f"Indent: {result.get('indent', '')}")

from ipykernel.ipkernel import IPythonKernel

kernel = IPythonKernel()

# Execute some code first
kernel.do_execute("x = 42")
kernel.do_execute("y = x * 2")

# Get recent history
history = kernel.do_history(
    hist_access_type='tail',
    output=True,
    raw=False,
    n=5
)

for session, line_num, input_code in history['history']:
    print(f"[{line_num}]: {input_code}")

from ipykernel.ipkernel import IPythonKernel

kernel = IPythonKernel()

# Get kernel information
info = kernel.kernel_info
print(f"Language: {info['language_info']['name']}")
print(f"Version: {info['language_info']['version']}")
print(f"Protocol version: {kernel.protocol_version}")