🔒 convert a function into a yield each time it evaluates another function

[lament bear]

This might just be too crazy to be possible but I figured it might be worth a try asking.
Lets say I have two functions, where solver evaluates objective arbitrary amount of times, and can be taken from various libraries (so I can't edit it).

def objective(x): return x**2
def solver(objective):
  x = 100
  for i in range(10):
    # do stuff with x
    value = objective(x)

is there any way to convert an arbitrary function like solver into a generator which yields each time it evaluates objective? This is what I want to convert it to:

def objective(x): return x**2
def solver(objective):
  x = 100
  for i in range(10):
    # do stuff with x
    value = objective(x)
    yield

[strong umbra]

@lament bear

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[frank elbow]

it already works?

>>> def objective(x):
...   print(f'received {x}')
...
>>>
>>> def solver(objective):
...   x = 100
...   for i in range(10):
...     # do stuff with x
...     value = objective(x)
...     yield
...
>>> solver(objective)
<generator object solver at 0x000001A01E87C9E0>
>>> for _ in solver(objective):
...   continue
...
received 100
received 100
received 100
received 100
received 100
received 100
received 100
received 100
received 100
received 100
>>>

like whats the problem

[lament bear]

yeah but solver is imported from various libraries so I can't directly edit it

[frank elbow]

I 'edited' it to print so you can see it run

but otherwise, it did run 10 times and 10 times only, so seems to be working

[lament bear]

I meant that I can't add yield to it because its imported, I just added it for demonstration, but in libraries it doesn't have yield, and I need to change it to have yield, but without editing it manually

[frank elbow]

oh, solver is imported, my fkin eyes

then I don't really think so

[steady bane]

Theoretically you could fake a generator-like behaviour by running solver in another thread, and having objective block each time it's called until it gets a signal to proceed.

[strong umbra]

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