lazy-loader

import lazy_loader as lazy import os # This would typically be in your package's __init__.py # For demonstration, we simulate it. # Define a dummy 'heavy_module' that prints when imported # In a real scenario, this would be a separate file or external library with open('heavy_module.py', 'w') as f: f.write("""print('heavy_module imported!') def expensive_func(): return 'Result from expensive_func' """) # Create a dummy package directory and __init__.py os.makedirs('mypackage', exist_ok=True) with open('mypackage/__init__.py', 'w') as f: f.write("""import lazy_loader as lazy __getattr__, __dir__, _ = lazy.attach( __name__, __file__, subpackages=[ 'heavy_module', # This will be lazily loaded ], attributes={ 'my_utility_func': ('some_utility_module', 'my_utility_func') # Example for external functions } ) # If you also wanted to lazy load an external library directly (less common in __init__.py) # external_lib = lazy.load('sys') # Example: lazily load 'sys' """) print("Before importing mypackage") import mypackage print("After importing mypackage (heavy_module not yet loaded)") # Accessing an attribute of mypackage.heavy_module triggers its load result = mypackage.heavy_module.expensive_func() print(f"Accessed heavy_module: {result}") # Clean up dummy files os.remove('heavy_module.py') os.remove('mypackage/__init__.py') os.rmdir('mypackage')