Python - Function array class

Question

How should I implement the following class? I want to create class that executes methods in random order when called and after all methods are called once reset array and reshuffle?

import random

class RandomFunctions(object):

    def f1():
        print("1")
    def f2():
        print("2")
    def f3():
        print("3")

    f = [f1, f2, f3]

    def __init__(self):
        super(RandomFunctions, self).__init__()
        random.shuffle(self.f)

    def execute(self):
        func = self.f.pop()
        if not self.f:
            reset f
        return func

def main():
    f = RandomFunctions()
    for i in range(6):
        f.execute()()

main()

These are the two ideas I came up with, but I'm still wondering what would be the smartest way to implement this sort of class?

discard = []
n = 0

    def execute(self):
        func = self.f[self.n]
        self.n += 1
        if self.n == len(self.f):
            self.n = 0
            random.shuffle(self.f)
        return func

    def execute_with_discard(self):
        func = self.f.pop(0)
        discard.append(func)
        if not self.f:
            f = discard[:]
            discard = []
            random.shuffle(self.f)
        return func

Hint: your constructor already contains most of the reset() method. Factor it out. Don't forget to refill the depleted list. Module copy could help you copy a list, or you could use the copy_of_list = source_list[:] idiom. — 9000
– 9000, Commented Sep 9, 2013 at 14:34

Leonid Shvechikov · Accepted Answer · 2013-09-09 14:43:10Z

2

import random

class RandomFunctions(object):

    def f1(self):
        print("1")

    def f2(self):
        print("2")

    def f3(self):
        print("3")

    def execute(self):
        if not getattr(self, 'functions', None):
            self.functions = [self.f1, self.f2, self.f3]
            random.shuffle(self.functions)
        return self.functions.pop()


def main():
    f = RandomFunctions()
    for i in range(6):
        f.execute()()


main()

answered Sep 9, 2013 at 14:43

Leonid Shvechikov

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Comments

tobias_k · Accepted Answer · 2013-09-09 14:44:28Z

1

Does it have to be a class like this? You could use a generator function:

def get_random_functions(*functions):
    while True:
        shuffled = list(functions)
        random.shuffle(shuffled)
        while shuffled:
            yield shuffled.pop()

for f in get_random_functions(f1, f2, f3):
    f()

Of course, if you prefer your class structure, you can use this by creating the generator in your __init__ method (self.gen = get_random_functions(*f)) and then have your execute method return next(self.gen).

answered Sep 9, 2013 at 14:44

tobias_k

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Comments

Ethan Furman · Accepted Answer · 2013-09-09 15:37:19Z

1

import random

class RandomFunctions(object):

    def f1():
        print("1")
    def f2():
        print("2")
    def f3():
        print("3")

    f = [f1, f2, f3]

    def __init__(self):
        self.reset()

    def execute(self):
        func = self.f.pop()
        if not self.f:
            self.reset()
        return func()   # execute the function, return the result (if any)

    def reset(self):
        self.f = self.__class__.f[:]    # make copy of class f
        random.shuffle(self.f)

def main():
    f = RandomFunctions()
    for i in range(6):
        f.execute()     # now we only need one pair of parenthesis

main()

answered Sep 9, 2013 at 15:37

Ethan Furman

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