[Python-ideas] Re: [Feature] Body closure

[Alexandre Brault]

On 2020-07-13 5:12 p.m., Joao S. O. Bueno wrote:

You know you can simply pass functions as parameters, right?
def lock(func, *args):
   # ...setup
   result = func(*args)
   #... teardown
  return result.

And then, with 3 more lines you do a decorator out of that

def locked(func):
    # <'lock' body as above>
    return lock


in the end:

@locked
def mythings():
   # code that runs 'locked'
   ...


On Mon, 13 Jul 2020 at 17:48, > wrote:


Today I think about lambda in Python and what if we introduce the
new syntax:
```python
def lock(*args, closure):
    # Do some stuff
    closure() # Call closure
    # Finish stuff

if __name__ == '__main__':
    lock():
        # Do some things here is thread safe
```

This feature could be very similar as in `Kotlin` inline functions
https://kotlinlang.org/docs/reference/inline-functions.html


Or even better, a context manager

from contextlib import contextmanager
@contextmanager
def lock(*args):
    # Do some stuff
    yield
    # Finish stuff

if __name__ == '__main__':
    with lock():
    # Do somethings here is thread safe

It's even so interesting that I don't even need to implement the lock 
function; there's already the Lock class in the threading module


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[Python-ideas] Re: [Feature] Body closure

[Joao S. O. Bueno]

You know you can simply pass functions as parameters, right?
def lock(func, *args):
   # ...setup
   result = func(*args)
   #... teardown
  return result.

And then, with 3 more lines you do a decorator out of that

def locked(func):
# <'lock' body as above>
return lock


in the end:

@locked
def mythings():
   # code that runs 'locked'
   ...


On Mon, 13 Jul 2020 at 17:48,  wrote:

> Today I think about lambda in Python and what if we introduce the new
> syntax:
> ```python
> def lock(*args, closure):
> # Do some stuff
> closure() # Call closure
> # Finish stuff
>
> if __name__ == '__main__':
> lock():
> # Do some things here is thread safe
> ```
>
> This feature could be very similar as in `Kotlin` inline functions
> https://kotlinlang.org/docs/reference/inline-functions.html
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> Python-ideas mailing list -- python-ideas@python.org
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>
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