Python - Get original function arguments in decorator

Python - Get original function arguments in decorator

In Python, you can get the original function arguments inside a decorator by accessing the *args and **kwargs arguments passed to the wrapper function that the decorator defines. Here's how you can do it:

def my_decorator(func): def wrapper(*args, **kwargs): # Access the original function's arguments print("Original function arguments:") print("Positional arguments (args):", args) print("Keyword arguments (kwargs):", kwargs) # Call the original function result = func(*args, **kwargs) # You can also access the result of the original function if needed print("Result of the original function:", result) return result return wrapper @my_decorator def my_function(a, b, c=0): return a + b + c # Call the decorated function my_function(1, 2, c=3)

In this example:

  • my_decorator is a decorator that takes a function func as its argument and defines a wrapper function wrapper inside it.

  • Inside the wrapper function, you can access the original function's arguments using *args and **kwargs. The args variable contains the positional arguments, and the kwargs variable contains the keyword arguments.

  • After printing the original function's arguments, the decorator calls the original function func with the same arguments using func(*args, **kwargs).

  • You can also access the result of the original function if needed.

  • The @my_decorator decorator is applied to the my_function function, so when you call my_function(1, 2, c=3), it will be wrapped by my_decorator, and the original function's arguments will be printed.

When you run the code, you'll see the original function's arguments being printed by the decorator:

Original function arguments: Positional arguments (args): (1, 2) Keyword arguments (kwargs): {'c': 3} Result of the original function: 6

You can access and manipulate the original function's arguments and result as needed within the decorator.

Examples

  1. How to access original function arguments inside a Python decorator? Description: Learn how to retrieve and manipulate the original arguments passed to a function within a decorator in Python using *args and **kwargs.

    def my_decorator(func): def wrapper(*args, **kwargs): # Access and manipulate original arguments here print("Original arguments:", args, kwargs) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  2. Python: Get function arguments inside a decorator using inspect module? Description: Understand how to use the inspect module in Python to access and inspect the original arguments passed to a function within a decorator.

    import inspect def my_decorator(func): def wrapper(*args, **kwargs): argspec = inspect.getfullargspec(func) print("Original arguments:", args, kwargs) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  3. How to retrieve original function arguments in a Python decorator using functools.wraps? Description: Learn how to use functools.wraps to preserve the original function's signature and retrieve its arguments within a decorator.

    from functools import wraps def my_decorator(func): @wraps(func) def wrapper(*args, **kwargs): print("Original arguments:", args, kwargs) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  4. Python: Access and modify function arguments in a decorator using locals()? Description: Understand how to utilize the locals() function to access and modify the original arguments passed to a function within a decorator.

    def my_decorator(func): def wrapper(*args, **kwargs): original_args = locals() print("Original arguments:", original_args) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  5. How to get original function arguments inside a Python decorator using function.code.co_varnames? Description: Learn how to access the original function's arguments using function.__code__.co_varnames within a decorator in Python.

    def my_decorator(func): def wrapper(*args, **kwargs): arg_names = func.__code__.co_varnames[:func.__code__.co_argcount] original_args = {name: value for name, value in zip(arg_names, args)} original_args.update(kwargs) print("Original arguments:", original_args) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  6. Python: Retrieve and manipulate function arguments within a decorator using inspect.signature? Description: Understand how to use the inspect.signature function to retrieve and manipulate the original arguments passed to a function within a decorator.

    import inspect def my_decorator(func): signature = inspect.signature(func) def wrapper(*args, **kwargs): bound_args = signature.bind(*args, **kwargs) print("Original arguments:", bound_args.arguments) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  7. How to access original function arguments inside a Python decorator using decorator arguments? Description: Learn how to pass arguments to a decorator to access and manipulate the original arguments passed to a function in Python.

    def my_decorator(arg): def decorator(func): def wrapper(*args, **kwargs): print("Original arguments:", args, kwargs) return func(*args, **kwargs) return wrapper return decorator @my_decorator("argument") def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  8. **Python: Access original function arguments in a decorator using *args and kwargs? Description: Understand how to access the original arguments passed to a function within a decorator using *args and **kwargs.

    def my_decorator(func): def wrapper(*args, **kwargs): print("Original arguments:", args, kwargs) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  9. How to retrieve original function arguments in a Python decorator using function.code.co_varnames? Description: Learn how to access the original function's arguments using function.__code__.co_varnames within a decorator in Python.

    def my_decorator(func): def wrapper(*args, **kwargs): arg_names = func.__code__.co_varnames[:func.__code__.co_argcount] original_args = {name: value for name, value in zip(arg_names, args)} original_args.update(kwargs) print("Original arguments:", original_args) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

  10. Python: Retrieve and manipulate function arguments within a decorator using inspect.signature? Description: Understand how to use the inspect.signature function to retrieve and manipulate the original arguments passed to a function within a decorator.

    import inspect def my_decorator(func): signature = inspect.signature(func) def wrapper(*args, **kwargs): bound_args = signature.bind(*args, **kwargs) print("Original arguments:", bound_args.arguments) return func(*args, **kwargs) return wrapper @my_decorator def my_function(a, b, c): return a + b + c result = my_function(1, 2, c=3) print("Result:", result)

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