call list of function using list comprehension

Question

can I call a list of functions and use list comprehension?

def func1():return 1
def func2():return 2
def func3():return 3

fl = [func1,func2,func3]

fl[0]()
fl[1]()
fl[2]()

I know I can do

for f in fl:
   f()

but can I do below ?

[f() for f in fl]

A additional question for those kind people, if my list of functions is in class, for example

class F:

    def __init__(self):
        self.a, self.b, self.c = 0,0,0

    def func1(self):
        self.a += 1

    def func2(self):
        self.b += 1

    def func3(self):
        self.c += 1

    fl = [func1,func2,func3]

fobj= F()

for f in fobj.fl:
    f()

does it work?

just had a go, it does work, I didn't have the python shell when I was think the question... — Jerry Gao, Mar 28 '11 at 16:26
http://docs.python.org/release/3.2/tutorial/datastructures.html#list-comprehensions — Tyler Crompton, Mar 28 '11 at 18:50

score 27 · Answer 1 · answered Mar 28 '11 at 15:48

27

>>> [f() for f in fl]
[1, 2, 3]

Absolutely :)

answered Mar 28 '11 at 15:48

Mike Lewis

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P2bM · Accepted Answer · 2011-03-29T16:59:04.323

18

Of course you can as Fábio Diniz said :), However for the class method when used as a callable, an object must be given as an argument:

fobj= F()

for f in fobj.fl:
    f(fobj)

The object must be given as an argument to the callable because when you look at the definition of the method def funcX(self): the method needs one argument "self"

edited Mar 29 '11 at 16:59

answered Mar 29 '11 at 04:06

P2bM

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1

How do I do this if I need to pass arguments to the functions? – vipulnj Apr 24 '19 at 22:38

score 1 · Answer 3 · answered Mar 28 '11 at 15:49

1

Yes, you can. The resultant list will hold the return values of your functions.

answered Mar 28 '11 at 15:49

nmichaels

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score 0 · Answer 4 · answered Mar 28 '11 at 15:48

0

Yes, you can - the functions get called as intended.

answered Mar 28 '11 at 15:48

Alexander Gessler

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call list of function using list comprehension

4 Answers4

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