Notebook Export

def nb_export():
    """
    Export notebooks to Python modules.
    
    Processes all notebooks in the project's nbs_path, extracting cells marked
    with #|export directives and converting them to proper Python modules
    in the lib_path directory. Handles imports, documentation, and code structure.
    """

from nbdev.export import nb_export

# Export all notebooks in project to Python modules
nb_export()

class ExportModuleProc:
    """
    A processor which exports code to a module.
    
    Processes notebook cells and organizes them into Python modules
    based on export directives and default export destinations.
    """
    
    def begin(self):
        """Initialize module collections and __all__ tracking."""
    
    def _default_exp_(self, cell, exp_to: str):
        """Set default export destination for subsequent cells."""
    
    def _export_(self, cell, exp_to: str = None):
        """Export cell to module and include in __all__."""
    
    def _exporti_(self, cell, exp_to: str = None):
        """Export cell to module without including in __all__."""
    
    def __call__(self, cell):
        """Process a single notebook cell."""

from nbdev.export import ExportModuleProc
from nbdev.process import NBProcessor

# Create processor for a specific notebook
proc = ExportModuleProc()
processor = NBProcessor('example.ipynb', procs=[proc])
processor.process()

# Access exported modules
for module_name, cells in proc.modules.items():
    print(f"Module {module_name}: {len(cells)} cells")

def black_format(cell, force: bool = False):
    """
    Processor to format code with black.
    
    Args:
        cell: Notebook cell to format
        force: Turn black formatting on regardless of settings.ini
        
    Formats cell source code using black if black_formatting is enabled
    in configuration or force is True. Only processes code cells.
    
    Raises:
        ImportError: If black is not installed but formatting is requested
    """

from nbdev.export import black_format
from execnb.nbio import NbCell

# Create a code cell
cell = NbCell('def hello():\n  print("world")', 'code')

# Format with black
black_format(cell, force=True)
print(cell.source)  # Properly formatted code

def scrub_magics(cell):
    """
    Remove IPython magics from cell source.
    
    Args:
        cell: Notebook cell to process
        
    Removes or converts IPython magic commands (lines starting with % or %%)
    that shouldn't appear in exported Python modules.
    """

def optional_procs():
    """
    Get list of optional processors for export.
    
    Returns:
        List of processor classes that can be optionally included
        in the export pipeline based on configuration settings.
        
    Optional processors may include:
    - black_format: Code formatting
    - Additional custom processors
    """

# In notebook cell 1:
#|default_exp core

# In notebook cell 2:  
#|export
def public_function():
    """This will be in __all__"""
    pass

# In notebook cell 3:
#|exporti  
def _private_function():
    """This won't be in __all__"""
    pass

# In notebook cell 4:
#|export utils
def utility_function():
    """This goes to utils module"""
    pass

from nbdev.export import nb_export, ExportModuleProc
from nbdev.config import get_config

# Check configuration
config = get_config()
print(f"Notebooks: {config.nbs_path}")
print(f"Library: {config.lib_path}")

# Export all notebooks
nb_export()

# The export creates:
# - Python modules in lib_path
# - Proper __init__.py files  
# - __all__ declarations
# - Import statements
# - Documentation strings