Python: queue method wait_for predicate with arguments
I'm trying to utilize the wait_for method of the queue module. I have a callable for the predicate, and it works if I don't pass any arguments, however the callable requires an int argument.
WORKS:
self.cv.wait_for(fn, timeout=5.0)
FAILS:
self.cv.wait_for(fn(1), timeout5.0)
This generates the error "bool is not callable".
I've tried the following:
self.cv.wait_for((fn(1)) , timeout=5.0)
Result: bool is not callable
self.cv.wait_for((fn, 1), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn, 1)(), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn(), 1), timeout=5.0)
Result: fn missing 1 required positional argument: 'int'
fn is a simple function just for testing.
fn:
def fn(int):
if int:
return True
else:
return False
Any guidance is greatly appreciated.
python python-3.x
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
add a comment |
I'm trying to utilize the wait_for method of the queue module. I have a callable for the predicate, and it works if I don't pass any arguments, however the callable requires an int argument.
WORKS:
self.cv.wait_for(fn, timeout=5.0)
FAILS:
self.cv.wait_for(fn(1), timeout5.0)
This generates the error "bool is not callable".
I've tried the following:
self.cv.wait_for((fn(1)) , timeout=5.0)
Result: bool is not callable
self.cv.wait_for((fn, 1), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn, 1)(), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn(), 1), timeout=5.0)
Result: fn missing 1 required positional argument: 'int'
fn is a simple function just for testing.
fn:
def fn(int):
if int:
return True
else:
return False
Any guidance is greatly appreciated.
python python-3.x
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
add a comment |
I'm trying to utilize the wait_for method of the queue module. I have a callable for the predicate, and it works if I don't pass any arguments, however the callable requires an int argument.
WORKS:
self.cv.wait_for(fn, timeout=5.0)
FAILS:
self.cv.wait_for(fn(1), timeout5.0)
This generates the error "bool is not callable".
I've tried the following:
self.cv.wait_for((fn(1)) , timeout=5.0)
Result: bool is not callable
self.cv.wait_for((fn, 1), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn, 1)(), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn(), 1), timeout=5.0)
Result: fn missing 1 required positional argument: 'int'
fn is a simple function just for testing.
fn:
def fn(int):
if int:
return True
else:
return False
Any guidance is greatly appreciated.
python python-3.x
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
I'm trying to utilize the wait_for method of the queue module. I have a callable for the predicate, and it works if I don't pass any arguments, however the callable requires an int argument.
WORKS:
self.cv.wait_for(fn, timeout=5.0)
FAILS:
self.cv.wait_for(fn(1), timeout5.0)
This generates the error "bool is not callable".
I've tried the following:
self.cv.wait_for((fn(1)) , timeout=5.0)
Result: bool is not callable
self.cv.wait_for((fn, 1), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn, 1)(), timeout=5.0)
Result: tuple object is not callable
self.cv.wait_for((fn(), 1), timeout=5.0)
Result: fn missing 1 required positional argument: 'int'
fn is a simple function just for testing.
fn:
def fn(int):
if int:
return True
else:
return False
Any guidance is greatly appreciated.
python python-3.x
python python-3.x
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
edited Nov 17 '18 at 22:38
Mad Physicist
35.3k156899
35.3k156899
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
asked Nov 17 '18 at 20:31
user2442072user2442072
79212
79212
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Condition.wait_for accepts a predicate that is a callable that accepts no arguments. The return value of the predicate can be anything since all objects have a boolean interpretation.
self.test is a callable that accepts one argument, so it is not a suitable predicate. self.test(1) is the object that is the result of calling the method, which is a bool, not a callable.
Your approach with the lambda is the simplest and easiest in this case:
self.cv.wait_for(lambda: self.test(1), timeout=5.0)
If your function is complex enough, you can have it return the predicate callable with appropriate refactoring, instead of wrapping it in a lambda. For example:
def fn(i):
def preficate():
return bool(i)
return predicate
...
self.cv.wait_for(fn(1), timeout=5.0)
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
add a comment |
I was able to solve it by using a lambda:
self.cv.wait_for( lambda: self.test(1), timeout=5.0)
But I'm curious as to if there are other ways?
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Condition.wait_for accepts a predicate that is a callable that accepts no arguments. The return value of the predicate can be anything since all objects have a boolean interpretation.
self.test is a callable that accepts one argument, so it is not a suitable predicate. self.test(1) is the object that is the result of calling the method, which is a bool, not a callable.
Your approach with the lambda is the simplest and easiest in this case:
self.cv.wait_for(lambda: self.test(1), timeout=5.0)
If your function is complex enough, you can have it return the predicate callable with appropriate refactoring, instead of wrapping it in a lambda. For example:
def fn(i):
def preficate():
return bool(i)
return predicate
...
self.cv.wait_for(fn(1), timeout=5.0)
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
add a comment |
Condition.wait_for accepts a predicate that is a callable that accepts no arguments. The return value of the predicate can be anything since all objects have a boolean interpretation.
self.test is a callable that accepts one argument, so it is not a suitable predicate. self.test(1) is the object that is the result of calling the method, which is a bool, not a callable.
Your approach with the lambda is the simplest and easiest in this case:
self.cv.wait_for(lambda: self.test(1), timeout=5.0)
If your function is complex enough, you can have it return the predicate callable with appropriate refactoring, instead of wrapping it in a lambda. For example:
def fn(i):
def preficate():
return bool(i)
return predicate
...
self.cv.wait_for(fn(1), timeout=5.0)
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
add a comment |
Condition.wait_for accepts a predicate that is a callable that accepts no arguments. The return value of the predicate can be anything since all objects have a boolean interpretation.
self.test is a callable that accepts one argument, so it is not a suitable predicate. self.test(1) is the object that is the result of calling the method, which is a bool, not a callable.
Your approach with the lambda is the simplest and easiest in this case:
self.cv.wait_for(lambda: self.test(1), timeout=5.0)
If your function is complex enough, you can have it return the predicate callable with appropriate refactoring, instead of wrapping it in a lambda. For example:
def fn(i):
def preficate():
return bool(i)
return predicate
...
self.cv.wait_for(fn(1), timeout=5.0)
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
Condition.wait_for accepts a predicate that is a callable that accepts no arguments. The return value of the predicate can be anything since all objects have a boolean interpretation.
self.test is a callable that accepts one argument, so it is not a suitable predicate. self.test(1) is the object that is the result of calling the method, which is a bool, not a callable.
Your approach with the lambda is the simplest and easiest in this case:
self.cv.wait_for(lambda: self.test(1), timeout=5.0)
If your function is complex enough, you can have it return the predicate callable with appropriate refactoring, instead of wrapping it in a lambda. For example:
def fn(i):
def preficate():
return bool(i)
return predicate
...
self.cv.wait_for(fn(1), timeout=5.0)
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
edited Nov 17 '18 at 23:40
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
answered Nov 17 '18 at 22:37
Mad PhysicistMad Physicist
35.3k156899
35.3k156899
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
add a comment |
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
Thank you, it's greatly appreciated. This raises another question, which I've asked here: link if you're willing.
– user2442072
Nov 17 '18 at 23:34
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
@user2442072 Glad that helped. An upvote would be nice. I'll be happy to see the link. Good on you for asking another question instead of asking for scope creep.
– Mad Physicist
Nov 17 '18 at 23:41
add a comment |
I was able to solve it by using a lambda:
self.cv.wait_for( lambda: self.test(1), timeout=5.0)
But I'm curious as to if there are other ways?
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
add a comment |
I was able to solve it by using a lambda:
self.cv.wait_for( lambda: self.test(1), timeout=5.0)
But I'm curious as to if there are other ways?
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
add a comment |
I was able to solve it by using a lambda:
self.cv.wait_for( lambda: self.test(1), timeout=5.0)
But I'm curious as to if there are other ways?
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
I was able to solve it by using a lambda:
self.cv.wait_for( lambda: self.test(1), timeout=5.0)
But I'm curious as to if there are other ways?
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
answered Nov 17 '18 at 20:46
user2442072user2442072
79212
79212
add a comment |
add a comment |
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