How can I pass a variable in a decorator to function's argument in a decorated function?

Question

I am in progress to learn Python. Hopefully someone points me to correct way.
This is what I'd like to do below:

def decorate(function):     def wrap_function(*args, **kwargs):         str = 'Hello!'  # This is what I want         return function(*args, **kwargs)     return wrap_function  @decorate def print_message():     # I'd like to pass 'str' as mentioned above     # to any functions' argument like below:     print(str)  # 'str' is same as above 

Any idea? Thanks in advance.

Answer 1

You can't pass it as its own name, but you can add it to the keywords.

def decorate(function):     def wrap_function(*args, **kwargs):         kwargs['str'] = 'Hello!'         return function(*args, **kwargs)     return wrap_function  @decorate def print_message(*args, **kwargs):     print(kwargs['str']) 

Alternatively you can name its own argument:

def decorate(function):     def wrap_function(*args, **kwargs):         str = 'Hello!'         return function(str, *args, **kwargs)     return wrap_function  @decorate def print_message(str, *args, **kwargs):     print(str) 

Class method:

def decorate(function):     def wrap_function(*args, **kwargs):         str = 'Hello!'         args.insert(1, str)         return function(*args, **kwargs)     return wrap_function  class Printer:     @decorate     def print_message(self, str, *args, **kwargs):         print(str)