Argument of the bool function

[Thomas Rachel]

Am 25.04.2011 16:29, schrieb Thomas Rachel:

or maybe even better (taking care for closures):

function = bool
value = 'the well at the end of the world'
## ...
actions.append(lambda val=value: function(val))
## ...
for function in actions:
results.append(function())

Or yet even better:

class Job(object):
def __init__(self, target, *args, **kwargs):
self.target = lambda: target(*args, **kwargs)
def __call__(self):
return self.target()

in order to do

actions.append(Job(function, val))
actions.append(Job(function, x=val))

and then (thanks, Chris...)

results = [function() for function in actions]


or maybe (additionally or alternatively)

class ActionQueue(list):
def addJob(self, target, *args, **kwargs):
self.append(lambda: target(*args, **kwargs))
def __call__(self):
if 0: # first thought
for job in self:
yield job()
else: # second thought - clean up...
while self:
job = self.pop(0)
yield job()

with

actions = ActionQueue()

actions.addJob(function, val)
actions.addJob(function, x=val)

results = list(actions()) # for collecting them and having them at once
# with generator, all call results can as well be emitted as soon as
they are available - depending what shall be done with the results


mmm... too much imagination I think... ;-)


Thomas

 

[Paul Rubin]

results = [function() for function in actions]

results = map(apply, actions)

 

[Ian Kelly]

Am 25.04.2011 16:29, schrieb Thomas Rachel:


Or yet even better:

class Job(object):
   def __init__(self, target, *args, **kwargs):
       self.target = lambda: target(*args, **kwargs)
   def __call__(self):
       return self.target()

in order to do

actions.append(Job(function, val))
actions.append(Job(function, x=val))

from functools import partial
actions.append(partial(function, val))
actions.append(partial(function, x=val))

Cheers,
Ian

 

[Steven D'Aprano]

results = [function() for function in actions]

results = map(apply, actions)

Sadly not in Python 3, where map is lazy and you need to add a call to
list to make it equivalent to the list comp.