Б>with manager() as m:
Б>  if m.condition:
Б>    ... code here ...
Б>

class Manager:
    def __init__(self):
        self.active=True
        self.last_fn=None
    def need_run(self,fn,scope):
        print("run",scope,self.active)
        return self.active

def exec_with(manager,scope=""):
    def decorator(fn):
        manager.last_fn=fn
        if manager.need_run(fn,scope): fn(manager)
    return decorator

manager=Manager()

#---------------------------------------------------

@exec_with(manager,"main")
def body(m):
    print("code here 1")

manager.active=False

@exec_with(manager,"optional")
def _(m):
    print("code here 2")