mo-imports

import os # Example for breaking cyclic dependencies with expect/export # File: foos.py # from mo_imports import expect # bar = expect("bar") # def foo(): # return bar() + " from foo" # # File: bars.py # from mo_imports import export # from foos import foo # def bar(): # return foo() + " from bar" # export("bar", bar) # Simulating the usage (actual usage requires separate files) # To demonstrate, imagine 'foos.py' defines 'bar' as expect('bar') # and 'bars.py' defines 'bar' and then export('bar', bar) # Example for delayed import # File: lazy_module.py # def some_function(): # return "Function from lazy_module" # File: main_app.py from mo_imports import delay_import # Instead of: from lazy_module import some_function # We use delay_import: lazy_function = delay_import("lazy_module.some_function") print(f"Initial state: {lazy_function}") # This is a proxy object, not the actual function yet # The import happens when lazy_function is first 'used' # For a function, this means when it's called. try: result = lazy_function() print(f"Result from delayed import: {result}") except ImportError as e: print(f"Caught expected ImportError: {e}") print("Note: For this example to run correctly, 'lazy_module.py' must exist in the Python path.") # For demonstration, let's create a dummy lazy_module.py temporarily with open('lazy_module.py', 'w') as f: f.write('def some_function():\n return "Function from lazy_module"\n') # Rerun the delayed import to show it working import sys # Remove from sys.modules to force re-import if it was loaded before if 'lazy_module' in sys.modules: del sys.modules['lazy_module'] lazy_function_working = delay_import("lazy_module.some_function") print(f"Result from delayed import after creating file: {lazy_function_working()}") # Clean up the dummy file os.remove('lazy_module.py')