Decorators in python

[riyaz]

Hi, I am a very newbie in this forum, being in this got a question to raise.
I keep getting errors while using the decorator function. Please assist me with your thoughts.
Here I have code for ‘decorator’ , the main program following the error.

‘decorator’ code is as follows:

def print_twice(func):
    def wrapper_print_twice(*args, **kwargs):
        func(*args, **kwargs)
        return func(*args, **kwargs)
    return wrapper_print_twice()

‘main’ code where I am trying to print fuction by passing parameters.

from decorate import print_twice

@print_twice
def say_hi(name):
    print('creating name')
    return f'Hello, {name}'

say_hi('Bob')

Receiving following error, unable to fix at my end.

Traceback (most recent call last):
  File "C:\Users\r58\PycharmProjects\Project_July_200_Target\Example_1_decorator.py", line 5, in <module>
    def say_hi(name):
  File "C:\Users\r58\PycharmProjects\Project_July_200_Target\decorate.py", line 11, in print_twice
    return wrapper_print_twice()
  File "C:\Users\r58\PycharmProjects\Project_July_200_Target\decorate.py", line 9, in wrapper_print_twice
    func(*args, **kwargs)
TypeError: say_hi() missing 1 required positional argument: 'name'

[JeremyLT]

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

[sanity]

Take a closer look at the print_twice function, specifically at what it returns. Keep in mind that decorator function should return wrapper function.

[riyaz]

Dear Sanity, Thank you. I’ve had multiple trials to look forward to the return of wrapper function (the inner one), however, I don’t find any glitch over in the procedural functional.
Please help me.

[sanity]

print_twice function returns result of the executed wrapper function, instead of just the wrapper function.

[riyaz]

Dear Sanity, You are obviously perfect. Yes, the called function in the inner method should be a First-class object and returned to the main program. The issue has been fixed with the following code.

def print_twice(func):
@functools.wraps(func)
def wrapper_print_twice(*args, **kwargs):
value = func(*args, **kwargs)
return value
return wrapper_print_twice()

[riyaz]

Dear Sanity, Understood, thank you.